BACKGROUND

　　Automated traffic signal performance measures (ATSPM) offer an alternative approach to traditional signal timing. ATSPM have been shown to help state departments of transportation (DOTs) and local transportation agencies improve operations at signalized intersections through reduced split failures, arrivals on red, red light running, and delays.

　　The right-of-way time allocated to different modes and movements can significantly impact behavior – drivers willing to take smaller gaps, pedestrians waiting for the walk signal, or bicyclists clearing an intersection. While not a true adaptive solution, ATSPM allow agencies to make near-real-time adjustments based on data from the field.

　　Research is needed to assist DOTs and local transportation agencies with quantifying the safety benefits and reductions in crash frequency and severity resulting from the deployment of ATSPM signal timing and developing crash modification factors (CMFs)

　　OBJECTIVE

　　The objective of this research is to develop CMFs for ATSPM signal timing for all modes and various conflict types and severity.

　　RESEARCH PLAN

　　Task descriptions are intended to provide a framework for conducting the research. The NCHRP is seeking the insights of proposers on how best to achieve the research objective. Proposers are expected to describe research plans that can realistically be accomplished within the constraints of available funds and contract time. Proposals must present the proposers’ current thinking in enough detail to demonstrate their understanding of the problem and the soundness of their approach to accomplishing the project objective. The work proposed for each phase must be divided into tasks and proposers must describe the work proposed in each task in detail.

　　The accomplishment of the project objective will require at the minimum the following tasks.