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three lane alternatives
Grand Avenue at Lexington, in St. Paul. This thriving commercial corridor is configured for three lanes through its whole length. It features permanent on-street parking, frequent bus service, plentiful pedestrian amenities, and room for bikes on the street.
Two of the four options presented for this project (options W-1
and W-4) are based on a three lane configuration for Lake
Street (similar to Grand Avenue in St. Paul).
Urban planners and transportation engineers throughout North
America have begun to advocate for this type of street configuration
as it can help create more inviting pedestrian environments
while meeting the needs of automobile traffic. You can find
background information and case studies below:
- Four
to Three Lane Conversions (253 Kb) - prepared by members
of Powderhorn Park Neighborhood Association's Housing and
Land Use Committee, this document summarizes the main issues
related to conversion of Lake Street to three lanes, including
advantages, disadvantages, and the specific conditions on
Lake Street that make this a reasonable design option. Also
includes a short discussion of traffic forecasting and reviews
the performance of prior traffic projections.
Rice Street in St. Paul has recently been converted from four lanes to a three lane roadway.
- The
Conversion of Four-Lane Undivided Urban Roadways to Three-Lane
Facilities (1.6 Mb) - a summary of issues related to
the conversion of urban four lane roadways like Lake Street
to three lanes. From a paper presented to AASHTO's Transportation
Research Board. AASHTO (the American Association of State
and Highway Transportation Officials) sets national engineering
and design standards related to highway transportation.
Includes an example from the conversion of Rice Street (in
St. Paul) from four lanes to three.
Marshall at Prior Avenue. Marshall is the continuation of Lake Street in St. Paul, and is a three lane roadway through its extent.
- Road
Diets - Fixing the Big Roads (750 Kb) - presents a summary
of experiences in improving roadway efficiency while reducing
the number of lanes roads carry. Includes examples from
the US and Canada.
- The
Chicago Bikelane Design Guide (1.2 Mb) - how the city
of Chicago manages to fit cars, permament on-street parking,
and bikelanes on 55 ft wide streets (Lake Street is 60 ft
wide).
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