Design for the most vulnerable street user rather than the largest possible vehicle. While designs must account for the challenges that larger vehicles, especially emergency vehicles, may face, these infrequent challenges must not dominate the safety or comfort of a site for the majority of daily users.
The selection of design vehicle influences the physical characteristics, safety, and operations of a roadway.
Neighborhood and Residential Streets
Downtown and Commercial Streets
Designated Truck Routes
Note: Trucks are permitted to use the full intersection when making turns onto a receiving street.
Designated Bus Routes
Note: Buses are permitted to use the full intersection when making turns onto a receiving street, but this is not preferable on a full-time bus route if it can be avoided.
Illinois General Assembly, “625 ILCS 5/ Illinois Vehicle Code,” Illinois Compiled Statues (Springfield).
FHWA Safety Program, “Traffic Calming,” accessed June 3, 2013.
Illinois General Assembly, “625 ILCS 5/ Illinois Vehicle Code, Section 11-205,” in Illinois Compiled Statues (Springfield).
Pennsylvania Department of Motor Vehicles, “Vehicle Code— Chapter 31,” (Harrisburg), 2.
Dan Burden and Paul Zykofsky. “Emergency Response: Traffic Calming and Traditional Neighborhood Streets,” (Sacramento: The Local Government Commission Center for Livable Communities, 2001).
Ryan Snyder et al. “Best Practices: Emergency Access in Healthy Streets,” (Los Angeles: Los Angeles County Department of Public Health, 2013).
“Design Criteria,” Seattle Right-of-Way Improvements Manual (Seattle: City of Seattle, 2012).
Transportation Alternatives, “1,200 NYC Pedestrians Struck On Sidewalks Every Year,” accessed June 3, 2013.
Adapted from the Urban Street Design Guide, published by Island Press.