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Distance-based method to estimate bike-ped exposure
The U.S. Federal Highway Administration (FHWA) has released a report on a new method to estimate pedestrian and bicyclist exposure in large urban areas. By calculating the average, estimated annual number of linear miles of roadway (or other motor vehicle shared facility) traveled by pedestrians and bicyclists in a given city, researchers can calculate a crash risk estimate defined as x number of crashes per 100 million miles of shared roadway travelled by pedestrians or bicyclists.
The report describes the application of this methodology to various shared facility types characteristic of the urban environment in Washington, D.C. These facilities included three types of intersections (signalized, four-way stop-controlled, and partially stop-controlled), midblock road segments, driveways, alleys, parking lots, parking garages, school areas, and areas with playing, dashing, or working in the roadway.