07 2006 MADISON, WISCONSIN

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BIKE LANES AND CAR DOORSDETAILS FOR DESIGNERS

• 07 2006 MADISON, WISCONSIN
• 14TH INTERNATIONAL CONFERENCE ON WALKING AND
  BICYCLING

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OUTLINE

• SAN FRANCISCO BACKGROUND AND BICYCLE NETWORK
• BICYCLE LANES WHY AND HOW?
• STUDY 1 PARKING LANE WIDTHS
• STUDY 2 PARKING T MARKINGS
• RECOMMENDATIONS

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SAN FRANCISCO
Area 47 Square Miles Population 780,000 (2nd
Densest City in U.S.) Terrain Hills! (31.5
Steepest) Percent Bicycle to Work
2.08 Recent Poll 5 of SF residents Use Bike
as primary mode of transportation
2000 Census (1 in US cities w/ gt500,000, 108
increase from 1990 Census)
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BICYCLE NETWORK

• 205 TOTAL MILES
• 30 Miles of Bike Paths
• 45 Miles of Bike Lanes
• 130 Miles of Shared Roadways
• -55 Miles of Wide Curb Lanes
• -80 Miles of Narrow Curb Lanes

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SHARED ROADWAY MARKING
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BICYCLE LANES
San Francisco Bicycle Coalition's 2006
SurveyWhat would make San Francisco a better
city for bicycling?
1 Response More bike lanes (21)
90 of respondents prefer to ride on streets with
bike lanes rather than streets without (6 no
opinion)
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CARS ARENT GOING AWAY
YET
Bay Area Trends 657 vehicles per 1000 persons in
1998 704 vehicles per 1000 persons in
2020 (Projected by Metropolitan Transportation
Commission)
San Francisco 480,000 Registered Vehicles 320,000
estimated on-street parking spaces High demand
for on-street parking
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BICYCLE LANE DESIGN
AASHTO GUIDE FOR THE DEVELOPMENT OF BICYCLE
FACILITIES MUTCD 2003 CALIFORNIA
SUPPLEMENT CALIFORNIA HIGHWAY DESIGN MANUAL

• Bike lanes adjacent to parking must be a minimum
  of 5 wide

• No minimum parking lane width

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From AASHTO Guide for the Development of Bicycle
Facilities
BICYCLIST OPERATING SPACE

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CVC ON-STREET PARKING

• CVC 22517.   No person shall open the door of a
  vehicle on the side available to moving traffic
  unless it is reasonably safe to do so and can be
  done without interfering with the movement of
  such traffic, nor shall any person leave a door
  open upon the side of a vehicle available to
  moving traffic for a period of time longer than
  necessary to load or unload passengers.

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DOORING COLLISIONS
The Door is Always Open

• San Francisco 2001-2005
• 1628 Bicycle Injury Collisions
• 133 From Doorings (8)

Courtesy of Department of Public Art - 1993
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Red dashed line 9.5 from curb (85 percentile
opened car doors)
50 in Door Zone
30 in Door Zone
10 in Door Zone
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PARKING LANE WIDTH STUDY
This second line will encourage parking closer
to the curb, providing added separation from
motor vehiclesPage 23, AASHTO Guide for the
Development of Bicycle Facilities
Will wider parking lanes encourage motorists to
park further away from the curb?
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STUDY LOCATION
11 Locations 600 Observations
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(No Transcript)
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(No Transcript)
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OTHER DESIGN FACTORS

• Context is Key!
• Wider Parking Lanes May Be Needed For
• Downhill Bike Lanes
• Commercial Areas with High Parking Turnover
• Areas Where Trucks Frequently Park to Load/Unload

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PARKING T STUDY
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Before - Parking Ts Extend to 9
After - Parking Ts Extend to 11
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(No Transcript)
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Before Average Position
After Average Position
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BEFORE Mean 10-4 76 gt 9.5 54 gt 10 24 IN
DOOR ZONE
AFTER Mean 10-11 90 gt 9.5 76 gt 10 10 IN
DOOR ZONE
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RECOMMENDATIONS

• Where space permits, wider parking lanes should
  be provided next to bike lanes to give cyclists
  more buffer from opening car doors
• Bike lane/parking lane design should take into
  account factors such as parking turnover,
  expected vehicle types, street grade
• Extended parking Ts show potential for
  encouraging cyclists to ride outside the door
  zone
• Design standards should be revisited, and should
  address door zone issue - Need for research with
  narrower bike lanes and other innovative
  treatments

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Red dashed line 9.5 from curb (85 percentile
opened car doors)
50 in Door Zone
30 in Door Zone
10 in Door Zone
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Red dashed line 9.5 from curb (85 percentile
opened car doors)
38 in Door Zone
13 in Door Zone
0 in Door Zone
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EDUCATION OF CYCLISTS
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EDUCATION OF MOTORISTS
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Dustin WhiteSF Municipal Transportation
Agencydustin.white_at_sfmta.com(415) 701-4603San
Francisco Bicycle Program www.bicycle.sfgov.org