National bicycling and walking study.
FHWA case study no. 20,
The effects of environmental design on the amount and type of bicycling and walking /
[prepared by the Project for Public Spaces]
Washington, DC : Federal Highway Administration, 
Choice of transportation.
Walking > Walking / United States.
Cycling > Cycling / United States.
Bicycle commuting > Bicycle commuting / United States.
40 p. ;
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