Developing Crash Modification Factors for Bicycle-Lane Additions While Reducing Lane and Shoulder Widths

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FHWA Publication No.: FHWA-HRT-21-012
FHWA Contact: Roya Amjadi, HRDS-20, ORCID: 0000-0002-8426-0867, (202) 493-3383, roya.amjadi@dot.gov

INTRODUCTION

The Federal Highway Administration's (FHWA's) Development of Crash Modification Factors (DCMF) program was established in 2012 to address highway-safety research needs for evaluating new and innovative safety strategies (e.g., improvements) by developing reliable quantitative estimates of their effectiveness in reducing crashes. Forty-one State departments of transportation provide technical feedback on safety improvements to the DCMF program and implement new safety improvements to facilitate evaluations. These States are members of the Evaluation of Low-Cost Safety Improvements Pooled Fund Study (ELCSI–PFS) that functions under the DCMF program.

This project evaluated the addition of bicycle lanes achieved by reducing lane and shoulder widths as a safety improvement strategy (e.g., safety intervention). The ELCSI–PFS Technical Advisory Committee selected this evaluation as one of the priorities within its purview.