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Title:

Bicyclist Safety Performance Functions for Road Segments in a U.S. City

Accession Number:

01658483

Record Type:

Component

Abstract:

Safety Performance Functions (SPFs) are able to estimate the relationship between collisions and exposure by accounting for the non-linear relationship between exposure and risk. While SPFs have been comprehensively developed for motor-vehicles, there is a need to further develop bicycle-specific SPFs. This paper uses data from eight years (2006-2013) in Boulder, Colorado to create the first bicycle-specific SPFs for roadway segments in a U.S. city that utilizes bicycle exposure. Such SPFs can help prioritize projects and inform the transportation decision-making process and future editions of the Highway Safety Manual. In this analysis, a negative-binomial model with log link was used to predict annual non-fatal motorist-bicyclist crashes on road segments per mile. The analysis shows that motor vehicle volume is a leading factor associated with more crashes between motor vehicles and bicyclists. Bicyclist exposure, population density, and percent retail land use are also predictive. The analysis also suggests that bicyclist exposure, at least in Boulder, Colorado, can be modeled as either bicycle volume or a combination of percent of road segment with a bike lane and pedestrian volume. While it is unlikely that pedestrian volume would be known and not bicycle volume, there may be cases where this surrogate for bicycle volume may be useful. However, results should not be interpreted to indicate that bicycle lanes cause crashes. The bike lane measure is likely a surrogate for bicyclist exposure.

Supplemental Notes:

This paper was sponsored by TRB committee ANB25 Standing Committee on Highway Safety Performance.

Report/Paper Numbers:

18-06245

Language:

English

Authors:

Nordback, Krista
Kothuri, Sirisha
Lan, Bo
Gibson, Geoff
Ferenchak, Nicholas N
Marshall, Wesley

Pagination:

6p

Publication Date:

2018

Conference:

Transportation Research Board 97th Annual Meeting

Location: Washington DC, United States
Date: 2018-1-7 to 2018-1-11
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

References

Geographic Terms:

Boulder (Colorado)

Subject Areas:

Highways; Pedestrians and Bicyclists; Planning and Forecasting; Safety and Human Factors

Source Data:

Transportation Research Board Annual Meeting 2018 Paper #18-06245

Files:

TRIS, TRB, ATRI

Created Date:

Jan 8 2018 11:37AM