Road Diets

Road Diets by Dan Burden and Peter Lagerwey
Road Diets
Nationwide, engineers are putting roads on diets, helping
them lose lanes and width. In the process formerly fat streets
often become leaner, safer, and more efficient. They become
Losing width
multi-modal and more productive. In many cases these former
warrior roadways are tamed and turned into angels.
and gaining
Often these changed roads set the stage for millions or mega-
respect
millions of dollars in new commercial and residential develop-
ment. The change can increase value of existing properties. In
some cases costs of reconstructing roadways are repaid in as
little as one year through increased sales tax or property tax
revenue.
Can our nation's roads gain ef-
ficiency, mode share and safety
Roadway conversions discussed here may be just the ticket to
by getting leaner? Many are start remaking unhealthy, unsafe city neighborhoods or commer-
doing just that.
cial districts and turn them into more robust, vital, economically
sound places. Road conversion may be undertaken to create
safer, more efficient ways to provide access and mobility for
pedestrians, bicycle riders and transit users, as well as motorists.
They improve livability and quality of life for residents and
shoppers. Just as with human diets, road diets without doctors
(transportation planners and engineers) analyses and prescrip-
tions, might be foolhardy.
Mobility and Access Improve. Four-lane road-
ways significantly discourage mobility and access of
transit users (cannot cross these streets), pedestrians
and bicyclists. Communities, interested in providing
higher levels of service and broadening transportation
choices, find street conversions essential to success.
Cities like Toronto in Ontario, Canada; Santa Monica,
Pasadena, Arcada and Mountain View in California;
Seattle, Kirkland, Gig Harbor, University Place and
Bellevue in Washington; and Portland, Eugene and
Bend in Oregon; are finding funds to increase mobility
and access by reducing the number of lanes and
widths of arterial and collector streets.
Conversions are Not New. Transportation
engineers and safety specialists have long known that
overloaded two-lane or four-lane roads of any volume
Turn Lanes Help Road Capacity
can be risky places to drive, conduct business, attempt to access
transit, walk or bicycle. On such roadways, frequent turning
Capacity remains the same. By keeping the full
movements into commercial and residential driveways can result
number of lanes at intersections, 4-lane to 2-lane
conversions often keep the same high capacity of
in high crash levels. On multi-lane roadways lane swapping adds
original 4-lane roadways. Turn lanes can be
friction and reduces performance.
created at intersections.
Safety Improvements. In the 1980s Pennsylvania DOT
engineers used FHWA safety monies to fully fund a study and to
convert a one-mile section of Electric Avenue in Lewistown,
Pennsylvania, from four lanes to three. The roadway was
carrying 13,000 ADT. After reviewing hours of time-lapse video
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© Walkable Communities, Inc. March 1999
and analyzing crash statistics and other data, the team concluded
that more uniform flow, reduced conflicts and great reduction in
crashes would result from four to three-lane conversion. The
change was made facing 95% opposition from local residents,
who felt that their trip times would increase.
Once the new roadway section was completed, new time-lapse
photography and data collection began. Dangerous maneuvers and
crashes dropped to nearly zero. Overall trip times were unaf-
fected. Today nearly 95% of those fearing the change are openly
thankful to PennDOT for making the roadway better for safety,
mobility and access.
Many Roadways Await Change. America has a
plethora of leftover four-lane roadways. Many
bypasses and other road improvements leave four-
lane roads ready for conversion. At the same time
thousands of miles of new four-lane sections are
proposed and built each year. Many of these road-
ways would be better designed with odd numbers of
lanes or two lanes, plus medians with turning pockets.
During the past twenty years many new roadways
have been constructed with three or five lanes. (Third
or fifth lanes are scramble or two-way left turn lanes
- TWLTLs.) These lanes add as much as 30 percent
to efficiency of movement, and they often cut number
Full roadway diets still move cars, but now the
of crashes in half. Significant bodies of research have
corridor moves people as well. Both Bellevue,
proven the value of shifting left turn movements from main
Washington, and Mountain View, California, have
through movement. Typically in these cases, however, roadways
converted formerly four-lane sections to
have been widened from two to three lanes or from four to five
pedestrian and bicycle friendly roads. Motorists
lanes.
benefit from more border width to fixed objects
and are more comfortable with bicyclists and
This widening often converts sidewalks and paved shoulders or
pedestrians.
requires high cost, right-of-way acquisition. In many such cases
,
roadway improvements only allow more cars into traffic
streams, encouraging communities to become more car dependent.
Increased congestion sends roadways level of service into long-
term slide. Changes often generate more speed, noise and danger
to people trying to walk, shop or live on main streets or neighbor-
hood collectors. Property values can diminish, and towns lose their
livability factors and competitive edges. This process of roadway
widening can be thought of as fattening a patient. The belt is let
out another notch, and the patient puts on a few more unhealthy
pounds toward auto dependency.
The Road Diet. Road dieting is a new term applied to
skinnying up patients (streets) into leaner, more productive
members of society. The ideal roadway patient is often a four-lane
road carrying 12-18,000 auto trips per day. Other roadway patients
may be helped through this same process. Some especially sick
four-lane patients may be carrying 19-25,000 cars per day, but still
qualify for diets. What are the symptoms that scream for change?
What roadways are ideal patients? And what are the upper limits?
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Road Diets by Dan Burden and Peter Lagerwey
Sick Road Patient Symptoms. Four lane road-
ways often generate excessive speeds. These road-
ways also erode the ability for transit, walking and
bicycling to succeed. How does this happen? Motor-
ists using four-lane roadways, note that there are
always spare lanes in their direction. They tend to
drive faster than they should. Motorists using multi-
lane roads seek to match speeds of other drivers.
Imprudent, speeding drivers tend to set prevailing
speeds. As traffic volumes increase, especially at rush
hour, risk of high-speed driving increases. During peak
volumes, right or left-turning movements occur. Also
during these times, many motorists drive close to one
another creating screens of impeded view. Last
minute, instant swapping of lane behavior to stay in motion leads
Spare Lanes Reward Speeders
to serious rear-end crashes. Motorists move from lanes of
slowing vehicles directly into the backs of other motorists who
have already slowed for their turns. The upper comfort range for
NW 8th Avenue in Gainesville, Florida. This
arterial conversions appears to be between 20-25,000 ADT.
four-lane roadway is an excellent candidate for
Higher numbers have been achieved. Santa Monica officials feel
road dieting. Today, motorists race from the
signal anticipating the merge to 2-lanes, 3000 feet
most comfortble capping at 20,000, although they have hit 25,000.
ahead. Excessive speeds of 50 mph are common.
School, park and bicycle trail crossing are located
Pedestrians at Risk. Pedestrians have rugged times finding
here. Two-lane roadway with bike lanes, medians
gaps across four lanes. Crash rates and severity of conflicts with
and turning lane at the intersection is suggested by
autos result in almost certain death (83% of pedestrians hit at 40
safety advocates as an alternative. The redesigned
roadway would increase capacity by lowering
mph die). Many bicyclists find four-lane roads too narrow to ride
speed.
comfortably. Transit users cannot safely cross streets at most
locations. Thus, many people, who have formerly had mode
choice, give up trying to cross streets converted to four lanes.
Instead they join the daily traffic stream and add to the road-
ways level of service drain.
Typical Patient and Process. Burcham Road in East
Lansing, Michigan, was formerly a fat road. Speeds were
excessive. Pedestrians near the high school found it unsafe to
cross the four-lane roadway. Neighbors complained about noise
and danger. East Lansings traffic engineer, John Matusik, P.E.,
felt that this roadway was a prime candidate for a road diet. The
roadway carried 11-14,000 cars per day (AADT). Viewed from
another perspective, 14,000 cars in four lanes over a ten hour
period is only 3,500 per lane per day, or 350 per hour for a ten-
hour period. Each lane is capable of carrying 1,900 cars per hour.
Thus, cutting the number of lanes in half wouldnt affect traffic
capacity.
The Diet Begins. The change on Burcham Road was made
(see picture). With leftover road space John added turn lane
(TWLTL) and bike lanes. The bike lanes give motorists more
border width, moving them six feet further from fixed objects
such as utility poles, hydrants and other fixed objects. Cars move
today at more uniform speeds (prudent drivers set prevailing
speeds). People are able to enter and exit driveways more easily.
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© Walkable Communities, Inc. March 1999
Pedestrians have six feet more separation from
motorists. Comfort levels of all people using the
corridor have markedly improved.
Bigger Roads, Same Diet. Once John had
proven he could make a moderate volume, four lane
into a healthier patient, he pushed Michigan DOT to
use the same diet strategy on a higher volume road,
the central artery through East Lansing, Grand River
Boulevard. The 23,000 AADT roadway had been
sluggish and risky for years. People did not enjoy
living along it or driving, walking, using transit or
bicycling this corridor. This roadway section was 1.1
miles in length. The roadway serves as a regional
traffic distributor. It has minimal number of commer-
cial driveways, thus turning movements are modest.
Burcham Roads Four-Lanes to
Three-Lanes
Two Stage Implementation. Michigan DOT staff took deep,
uncertain breaths and made this higher volume road conversion in
Pedestrians and motorists are more comfortable
two safe, evaluative steps. As Michigan DOT resurfaced Grand
today. Motorists are easily 10 feet from fixed
objects. As much as sixteen feet separate
River Boulevard, they wanted the option of going back to four
pedestrians from motorists.
lanes if the experiment didnt work. They painted new lane
markings, using two-lanes, plus center turn lane (TWLTL). They
omitted bike lanes in the first stage. Some drainage grates needed
to be swapped before they added bike lanes. But they also wanted
the chance to switch back. The conversion worked, but it was
slightly shaky. With the loss of two lanes on the departure side of
signalized intersections, traffic now merged into orderly, lower
paced movement. Speeds came down to more preferred speed of
around 35 mph (down from 40). Yet, some confusion remained.
Resulting travel lanes were sixteen feet wide. Second stage
markings were made six months later. Bike lanes were added,
narrowing travel lanes to twelve feet. Speeds were reduced
slightly more, and confusion ended. Today planners and engineers
from both city and state report greater safety, efficiency, and more
than adequate movement during peak hours. Again, people
walking, using transit and bicycling find the area more comfortable
and safe. Crash records are being kept. Potential conflicts and
speeds are greatly reduced. Property owners are pleased with
reduced speeding, noise and challenge of entering and exiting their
driveways safely. Bike lanes give them more turning radius and
improved sight triangles.
Today East Lansing is in the early stages of converting two to
six more roadways. They find that they can make many of these
conversions at no cost. They wait for lane markings to fade (easy
with winter snow plow scraping), or they make changes with
resurfacing projects.
Other Cities, Higher Numbers. East Lansing is not the first
community to make these changes. Seattle, Portland and Santa
Monica are three communities that have been making these lane
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Road Diets by Dan Burden and Peter Lagerwey
reductions for years. Seattle made its first conversion (N 45th
Street in 1972. Since then they have successfully converted 8
additional roadways. Many of these include commercial sec-
tions.
Kirkland, Washington, Pushes Numbers to the Limit. So
High Volume Conversion in
far, the record for roadway conversion with highest traffic counts
is Lake Washington Boulevard in Kirkland, Washington. This
Kirkland
largely residential street travels by high priced homes with
spectacular views of Lake Washington. When Lake
Washington Boulevard was operated with four lanes,
capacity problems were reached most evenings.
Residents trying to enter or exit driveways on both
sides of the road tended to constrain the flow on the
20,000 AADT roadway. Switching to three-lanes on
the roadway was easy. The results were impressive
not only to drivers, but to pedestrians, transit users
and bicyclists as well. Motorists now had substantial
added border width to fixed objects. Residents saw
reduction in speeding and noise levels, and they could
now enter and exit their driveways much more easily.
Kirkland Tests Ceiling with Lake Washington
Boulevard. In 1995, Kirkland closed another road-
way for reconstruction. They forced totals of 30,000
vehicles (ADT) onto the two + TWLTLroadway.
The roadway never crashed. These extremely high
numbers continue to astound researchers. What is the
upper limit? This 30,000 ADT may be it. In most
cases carrying capacity numbers must be lower.
For a short period during area road
Researchers do not have enough knowledge to say where and
construction, Kirklands Lake Washington
how peaks are reached, but many feel comfortable with 20-
Boulevard picked up additional load and was
23,000 ADT's. Each community must set its own upper limits.
successfully carrying 30,000 ADT. This four-
lane to three-lane conversion has been very
Four-Lane to Two-Lane Conversions. More aggressive
successful. Note how much easier it is for
motorists to enter and exit driveway., Added
diets drop four lanes down to two. Fewer roadways can undergo
border width provides motorists safer
this more aggressive conversion. Roadway conversions in
conditions. Caution, this 30,000 figure is real
Toronto, Ontario, are proving safety and livability benefits of
for one portion of this roadway, but may be
these changes, while holding to previous capacities. More than
beyond the comfort range of many. For a
more comfortable number 20-23,000 is
six formerly four-lane roadways have been converted to either
achieveable in most areas.
two-lane roads with medians and turning pockets, or simply two
lanes. St. George Street, a principal arterial through the Univer-
sity of Toronto Campus is perhaps the best known. This 16,000
ADT roadway owes its success to low number of driveways.
The roadway holds its full capacity at intersections by keeping
the previous number of storage lanes. The 1.l mile roadway
project was launched when a local benefactor to the University
of Toronto challenged the city to the improvement by putting up
her $1 million in match money. The University contributed
$500,000 (Canadian), and the City of Toronto gave the additional
$2.5 million match for a total rebuild price of $4 million. The road
was totally reconstructed. New foundations, improved intersec-
tions, greatly widened sidewalks, bike lanes and full canopy of
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© Walkable Communities, Inc. March 1999
St. George Street in
trees were placed. Today walking, transit and bicycling are
Toronto, Ontario
pleasurable activities; speeding has dropped, and the center of
campus has come alive with people.
Other Four-Lane to Two-Lane Conversions. Toronto has
also converted five other roadways. In each case the same
volume of auto traffic is serviced, always at lower, more appropri-
ate speeds. As with four-lane to three-lane conversions, prudent
drivers set the speed. Many of these additional roadways operate
with 11-17,000 ADT. Some sections are reduced from four lanes
to two lanes to incorporate critical pedestrian crossings; then they
widened back out 1,000 feet further downstream. Many combina-
tions of road diet techniques are practicable. Seattle, Washington;
Portland, Oregon; Santa Monica and Mountain View, California;
and dozens of other cities are making similar conversions. These
streets are made more business, resident, transit, bicycle and
pedestrian friendly by placing medians with turning pockets and
(Right and Above) In 1997 this one-
bike lanes in the mix.
mile section of St. George Street was
converted from four lanes to two
What is the future? In the past two years the principle author
lanes at a cost of $4 M Canadian.
of this article, Walkable Communities Director, Dan Burden, has
The roadway carries the same
capacity as before. Note capacity is
been to more than 500 cities in North America. Almost every
well handled at each intersection.
town he visits has at least two or three streets ideal for conver-
The project began when a benefactor
sion. In California, alone, more than 20 cities have made success-
to the University of Toronto pledged
ful conversions. Dans advice, Elected officials, business leaders
$1M on the condition that the
University and City would contribute
and engineers should look for easy conversions first. All but the
the balance of $3million.
most self-evident projects are likely to generate concern from
business leaders and nearby residents who worry that traffic might
back into their neighborhood streets. The public has come to
believe that the only way to improve roadways is to widen entire
sections. Model projects are needed.
Best Model Projects. First projects should include roadways
with some of the following criteria:
Ö
Moderate volumes (8-15,000 ADT)
Ö
Roads with safety issues
Ö
Transit corridors
Ö
Popular or essential bicycle routes/links
Ö
Commercial reinvestment areas
Ö
Economic enterprise zones
Ö
Historic streets
Ö
Scenic roads
Ö
Entertainment districts
Ö
Main streets
The Process of Change. Street conversions are as much
process as they are product. Due to the controversial nature of the
first road diet conversions, it is essential to involve the public
through highly interactive processes. As pointed out earlier in this
article with Electric Avenue in Lewistown, Pennsylvania, 95
percent of the citizens were against the change.
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Road Diets by Dan Burden and Peter Lagerwey
Effective process often includes focus groups, and highly
interactive workshops and designs. Citizens, residents and
business owners should help design both process and product.
Many cities are learning to conduct 3-6 day planning charrettes to
gain input from a variety of people who then gain ownership of
the results.Atlantic Boulevard in downtown Del Ray Beach,
Florida, was converted from four-lane to two-lane roadway at the
request of retailers. This request was the reverse of previous
thinking. Merchants often feel that more traffic passing their
doors is better for business. In Del Ray Beach the decaying
downtown forced merchants to take another look. Retailers
worked with the city manager, elected officials, and chamber of
commerce to weigh their risks and suggest changes. The net
result of this street conversion is one of the more successful
downtowns in Florida, and significant increase in local sales and
tax base for the town. Motorists did not leave Atlantic Boulevard
to take advantage of two new lanes of travel on parallel streets.
They come through the now attractive center, cruising at 15 mph.
Lane Reductions of Select Street Conversions-- Volume Changes
Roadway Section
Change
ADT (Before) (After)
Notes
1. Lake Washington Blvd.,
Kirkland, Washington
4 lanes to 2 + TWLTL + bike lanes
23,000
25,913
South of 83
2. Lake Washington Blvd,
Kirkland, Washington
4 lanes to 2+ TWLTL + bike lanes
11,000
12,610
Near downtown
3. Electric Avenue,
Lewistown, Pennsylvania
4 lanes to 2 + TWLTL + bike lanes
13,000
14,500
4. Burcham Road,
East Lansing, Michigan
4 lanes to 2 + TWLTL + bike lanes
11-14,000
11-14,000
5. Grand River Boulevard,
East Lansing, Michigan
4 lanes to 2 + TWLTL + bike lanes
23,000
23,000
6. St. George Street,
Toronto, Ontario, Canada
4 lanes to 2 + bike lanes + wide sidewalks
15,000
15,000
7. 120th Avenue, NE
Bellevue, Washington
4 lanes to 2 + TWLTL
16,900
16,900
8. Montana (commecial street)
4 lanes to 2 lanes + TWLTL
18,500
18,500
Bellevue, Washington
4 lanes to 2 + median + bike lanes
9. Main Street
4 lanes to 2 lanes + TWLTL
20,000
18,000
Santa Monica, California
4 lanes to 2 + median + bike lanes
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© Walkable Communities, Inc. March 1999
Lane Reductions of Select Street Conversions-- Volume Changes
Roadway Section
Change
ADT (Before)
ADT (After)
and Date
9. Danforth
4 lanes to 2 + bike lanes
22,000
22,000
Toronto, Ontario, Canada
4 lanes to 2+ turning pockets+ bike lanes
Seattle, Washington
10. Greenwood Avenue
4 lanes to 2, plus
N, from N. 80th St to N 50th
TWLTL Plus Bike lanes
April, 1995
11,872
11,2427
11. N 45th Street in
4 lanes to 2 lanes
Wallingford Area
plus TWLTL
19,421
20,274
Seattle, Washington
December, 1972
12. 8th Ave. NW in
4 lanes to 2 lanes
Ballard Area
plus planted median
10,549
11,858
Seattle, Washington
with turn pockets
January, 1994
13. Martin Luther
4 lanes to 2 lanes
King Jr. Way,
plus TWLTL, plus
12,336
13,161
north of I-90
bike lanes
Jan 1994
14. Dexter Avenue, N.
4 lanes to 2 lanes
East side of Queen
plus TWLTL
13,606
14,949
Anne Area
and bike lanes
15. 24th Ave. NW,
4 lanes to 2 lanes
from NW 85th St.
plus TWLTL
9,727
9,754
to NW 65th St.
16. Madison St., from
4 lanes to 2 lanes
7th Ave. to
plus TWLTL
16,969
18,075
Broadway
17. W. Government
4 lanes to 2 lanes
Way/Gilman Ave.
plus TWLTL plus
12,916
14,286
W,. from W Ruffner
bike lanes
St. to 31st Ave. W.
Dan Burden served for sixteen years as state bicycle and
Peter Lagerwey is the pedestrian/bicycle coordinator for the
pedestrian coordinator for the Florida Department of Trans-
City of Seattle Engineering Department. Peter has overseen and
portation. In his new role as the director of Walkable Commu-
monitored conversion of four street lane reduction projects.
nities, Inc., Dan has promoted and helped the process for more
Peter recently spent a full year on assignment as pedestrian/
than a dozen conversions of collector and arterial streets. Dan
bicycle planner for Perth, Australia. Peter is an instructor for
teaches courses for the Federal Highway Administration,
FHWAs Pedestrian Road Show, as well as for a number of state
National Highway Institute and the National Highway Traffic
agencies.
Safety Administration. Dan is the author of the Healthy Streets
booklet which provides guidelines for building traditional
Additional Article: See Andrew G. MacBeth, P.E. Calming
neighborhood development (TND), published by the Local
Arterials in Toronto, paper delivered to the 68th ITE Annual
Government Commission, Center for Livable Communities. For
Meeting, August 10, 1998 (Accepted by ITE for 1999 publica-
more information contact webpage: www.lgc.org/clc/
tion in ITE Journal)
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Road Diets by Dan Burden and Peter Lagerwey
Data on Street Conversions - Seattle, Washington
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© Walkable Communities, Inc. March 1999
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* LEGEND:
I = Intersection
M-B = Mid-Block
-11-

Road Diets by Dan Burden and Peter Lagerwey
Additional Road Diets Experiences
Santa Barbara
Over a decade ago, the City of Santa Barbara created bike lanes on two parallel one-way streets by removing
one of the two existing traffic lanes. The City's original proposal was to remove parking from one side to keep
two traffic lanes plus put in a bike lane. But since the streets are mostly residential, the people pressured the City
to keep parking and lose a traffic lane instead. Just about everybody thinks that it's a good solution.
In the next two months, another street will change from 4 traffic lanes to three (middle turn lane) plus bike
lanes on both sides.
Ralph Fertig
Santa Barbara Bicycle Coalition
www.sbbike.org
Palo Alto
Palo Alto did so on two streets (University Ave. & East Meadow Drive) in 1974 as part of its overall bikeways
plan. Since then Mountain View has done so on at least two streets, and just recently Sunnyvale has approved
doing so on part of Mathilda.
Ellen Fletcher
Sacramento
In Sacramento, on Auburn Boulevard, the city installed a bike lane by taking out on-street parking. After a few
months of this, the businesses howled. The City Council decided that the viability of the businesses were more
important, so they took the bike lane back out and put the parking back in.
This didn't happen that easily, though, since I put the question to the traffic engineers about taking the travel
lane space and give it to bikeway space. We were lucky this time, since there were two travel lanes one direction
and one travel lane going the other. When we challenged the staff to find out if they could shift the center line
over so that it was one travel lane in each direction, they answered that, yes, indeed this was a possibility. So they
did it, and we got our bike lanes back and the businesses had their parking! My only complaint was the time it
took to get the final product. It took them less than a week to re-establish the on street parking, and over a year
to re-adjust the lane striping. So, in a round-about way, we did get a travel lane removed for the installation of a
bike lane. But it was with a lot of luck that this happened. It isn't that common to find a spare travel lane that has
a low enough ADT to let the traffic engineers feel like giving it over to the bicycles. This incident is unusual for
Sacramento, so I wouldn't necessarily consider it to be the result of progressive thinking--they still need some
help in that department.
Ed Cox
edcox@jps.net
Santa Cruz
Santa Cruz has proposed reducing Soquel Avenue from 4 lanes to 3 (two plus turn lane) in order to install bike
lanes, but has not yet done so.
Cambridge
A portion of Massachusetts Avenue, the main drag of Cambridge, MA (also a state numbered route) was
redesigned, going from 4 lanes to 3, allowing not only bicycle lanes but also wider sidewalks and maintaining
parking. ADT is approx. 21,000. There are a couple of turning lanes. The project was completed about a year
ago.
Cara Seiderman
City of Cambridge, MA
-12-

© Walkable Communities, Inc. March 1999
Mountain View and Sunnyvale
1) A few years ago Mountain View, CA restriped the section of Dana Street from Calderon to Pioneer (across
Highway 85, the Stevens Creek Freeway), from 2 lanes each direction to 1 lane + bike lane in each direction,
adding a planted median. Contact rene.dalton@ci.mtnview.ca.us, their BAC staffer, for details.
2) Mountain View also restriped Cuesta (Drive?) west of Miramonte from 4 lanes down to 3 (i.e. center turn)
with bike lanes. This was done during a sewer line upgrade that required tearing up that whole stretch anyway.
That end of Cuesta abuts neighboring Los Altos, which never did 4-lane their collector streets back when Silicon
Valley was rapidly building out its street network; I believe that stretch of Cuesta didn't really need 4-lane
capacity anyway.
3) Sunnyvale, CA just decided to restripe Mary Avenue between Fremont Avenue and Homestead Road to
add bike lanes. I don't know the details on before and after lane counts on that stretch, but believe it's currently 2
lanes with on-street parking and a center 2-way left turn lane. Contact pubworks@ci.sunnyvale.ca.us or BAC
staffer Jack Witthaus <jwitthaus@ci.sunnyvale.ca.us>.
John.Ciccarelli@stanford.edu, Bicycle Program Manager
711 Serra Street, Stanford, California USA 94305-7240
voice 650-725-BIKE, fax 650-723-0790
http://www-facilities.stanford.edu/transportation
Greenbelt, MD
Glad you asked. The City of Greenbelt, MD eliminated two traffic lanes on Ivy Lane and Cherrywood Lane to
make room for bicycle lanes to the new Greenbelt Metro Station. The objectives were to (1) improve bicycle
access to the Metro Station (2) to calm traffic (3) to improve aesthetics and (4) to provide a median area for
pedestrians crossing the road. We are very happy with the results. Eventually, we plan to landscape the median.
The plans caused a tremendous uproar in 1996. The City received letters and complaints from the County
Executive, the Governor and our Congressman. They called Cherrywood Lane crucial to development plans near
the Greenbelt Metro Station.
The configuration was 12'-12'-12'-12'-12 narrowing to 12'-12' 12'-12' at an overpass. The configuration today
is 8'-6'-11'-18'median-11'-6' narrowing to 6'-11'-14'median-11'-6' at the overpass. The 8' lane is a parking lane.
The 6' lanes are marked and signed as bike lanes.
Greenbelt has a 60 year tradition of innovative planning and of making bicycle and pedestrian access a priority.
Our City Council loves to talk about Greenbelt's bike lanes.
Bill Clarke
Chairman, Greenbelt Bicycle Coalition
Austin, TX
To date we have removed travel lanes from two streets to make bike lanes. These streets were operating
below capacity as striped and we could demonstrate that the level of service would be acceptable after the
changes. There has been serious opposition to one near a federal IRS/Treasury/Veteran's complex. The admin-
istrators were convinced that the roadway with bike lanes would make their lives miserable due to increased
congestion. They continue to pressure the department and City Council so the final outcome is uncertain at this
time.
We are considering several other streets to remove travel lanes in favor of bike lanes, but it will take some time
to go through the political process to get this done.
Keith Snodgrass
Bicycle and Pedestrian Program Coordinator
Department of Public Works and Transportation
PO Box 1088
Austin, Texas 78767
512 499-7240 fax 512 499-7101
http://www.ci.austin.tx.us/bicycle/
-13-

Road Diets by Dan Burden and Peter Lagerwey
Ottawa
We have a project in Ottawa where a bridge is being reconstructed. The original cross-section included two
HOV (buses only) lanes and four car lanes (2 in each direction). The new cross-section includes two HOV
(buses only) in the outside lanes, then two car lanes and two bicycle lanes (one in each direction). A median was
also added. In essence, two car lanes were given over to bicycle lanes and a median. The bridge opens this spring
- we can hardly wait!
Daphne Hope
Alternative Transportation Planner
Denver
In Denver, we are removing 2 lanes of traffic on a collector street for approximately 2000' alongside a city golf
course so that we can build a 12' wide bikeway/multi use trail alongside the golf course frontage. The lanes on the
street were very narrow (10' wide I think) and the center turn lane served little purpose. The bike route that we
will sign runs the full width of the city - this was the major missing link. The process to do this was NOT FUN.
James MacKay
Boulder
Last year, after significant public process, the City of Boulder also removed a traffic lane to add a bike climbing
lane on Table Mesa Drive. The roadway was build in a era of different development expectations, and traffic
counts indicated that this could easily be done. However there was still significant public concern, which was in
part addressed by first doing a trial run where we blocked the lane with barricades for three weeks and collected
data, and then by selecting a non-structural project design where the changes were made by paint rather than
moving the curb face. This addition links several significant bike facilities and is working great.
Randall Rutsch
Transportation Planner
City of Boulder, CO
Salem, OR
The city of Salem, Oregon reconfigured 4 lanes to two lanes plus center turn lane and bike lanes on 17th Street
and possible others.
Michael Moule
Oregon Department of Transportation
Bend, Oregon
(541) 388-6216
michael.m.moule@state.or.us
http://www.odot.state.or.us/techserv/bikewalk/index.htm
Portland & Corvallis
The cities of Corvallis and Portland removed a travel lane from one-way couplets that had 4 lanes in each
direction (they now have 3). On top of bike lanes, motorists benefit from the reduced need to weave (getting from
one side to the other in anticipation of having to turn left or right), and pedestrians benefit from easier crossing
(Portland reduced pavement width and widened sidewalks and built curb extensions at sidewalks). ODOT bi-
cycle and pedestrian program was instrumental in preventing a couplet project from going to four lanes in one
direction, and keeping at 3 (Albany). So it's not uncommon. Seattle does it for traffic-calming.
Michael Ronkin
Bicycle and Pedestrian Program Manager
Oregon Department of Transportation
michael.p.ronkin@odot.state.or.us
(503) 986-3555
-14-

© Walkable Communities, Inc. March 1999
Hamilton, Canada
Just to add a Canadian perspective: The City of Hamilton, Ontario converted Stone Church Road from 4 lanes
to 3 lanes (center left turn lane) with bicycles being accommodated in wide curb lanes. A similar conversion will
take place this spring on Lawrence Road, this time using painted bicycle lanes. We also converted 2 major five-
lane streets to 4-lane with wide curb lanes in 1994, but Regional Council directed conversion back to the original
configuration about six months into the trial.
Hart Solomon
Manager of Traffic Engineering and Operations
City of Hamilton, Ontario
London, UK
I think it has been done here in London, England. For example, the London Borough of Ealing, has, I believe,
removed some car lanes on the Uxbridge Road, the A4020, that heads west out of London, adding bike lanes
instead. The current cry by bike activists here in England is 'reallocating road space' How much it is actually
being done, though, I do not know. Bike lanes are somewhat new here in England, and all the fiascoes of a quarter
a century ago in the USA seem to be being repeated here
JeremyParker@compuserve.com
London, England
Toronto
In Toronto, we have removed traffic lanes on approximately 18 km (12 miles) of downtown streets (eight
different streets) to provide bike lanes. These routes represent about two thirds of our existing bike lanes.
Typical downtown arterial widths are 12.8 to 14.0 meters wide and striped as four lane two way roads with
both curb lanes accommodating parking in the off-peak hours. During peak hours parking is generally prohibited
on both sides so the roads operate as four lane roads.
To incorporate bike lanes on a road 12.8 meters (42 feet) wide we permit 24-hour parking on one side (2.0
meters wide) , provide a bike lane (2.0 meters) next to parking, two general traffic lanes (3.5 meters) and a bike
lane next to the curb (1.8 meters). Left turn lanes are provided at signalized intersections to maintain capacity.
The length of the left turn slot is determined by the left turn demand, with a typical length being 15 meters.
Curbside parking stops in advance of the intersection to accommodate the additional lane required for left turns
and to make the transition between a bike lane adjacent to parking and a bike lane next to the curb. It is a fine
balance because the longer the left turn slot the less parking we can provide. Parking is definitely the most
politically sensitive issue when implementing bike lanes.
To incorporate a bike lane on a road 14.0 meters (46 feet) wide we permit 24-hour parking on both sides (2.0
meters wide), provide two bike lanes (1.8 meters) next to parking and two general traffic lanes (3.2 meters).
Again, left turn lanes are provided at signalized intersections to maintain capacity.
Based on our experience in the past few years we have concluded that the two above designs can work well
on roads with up to approx. 18,000 vehicles per day.
We have also provided bike lanes through three railway underpasses by, in each case, eliminating two general
traffic lanes (from four to two lanes -one in each direction) in order to provide two bike lanes. One of these
carried 22,000 vehicles per day.
On another 1.6 km stretch of roadway (55,000 vehicles per day) we reduced six general traffic lanes to five
lanes to accommodate two bike lanes over a bridge connecting east end neighborhoods to the Central Area.
Bicycle volumes on this route increased to approximately 3,000 bicycles per summer weekday; weekday average
throughout the year is 1,800 bicycles per day). In another case we reduced a six lane road with 30,000 vehicles
per day to four general traffic lanes (five at signalized intersections) to accommodate bicycle lanes in each
direction.
Greater Vancouver's experience:
"In the Greater Vancouver Region, two municipalities have removed a traffic lane for bikes. The City of Surrey
along their East Whalley Ring Road and the City of Richmond along Williams Road. In both instances, four lanes
of traffic (two in each direction) were reduced to three lanes to provide bike lanes. The third middle lane func-
tions as a left turn lane for both directions of traffic. I can give contacts if anyone wants more details.
Doug Louie, P.Eng.
City of Vancouver."
-15-