United States Department of Transportation
i
Safety benefits of implementing adaptive signal control technology : survey results.
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2013-01-01
[PDF-1.32 MB]
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Abstract:The safety benefits and costs associated with implementing adaptive signal control technology (ASCT) were evaluated in
this study. A user-friendly online survey was distributed to 62 agencies that had implemented ASCT in the United States.
Twenty-two agencies responded to the survey, providing information about the system type, detection type, and cost of
ASCT implementation. These agencies were from city governments (47%), state governments (29%), and county
governments (24%). They represented both a wide range of ASCT implementation rates (from 1 to 700 intersections) and
five of the most popular ASCT systems. There was a range of ASCT costs for different systems and detection types used
with the system. The average cost per intersection to the agencies that responded was $38,223 when cost data from all
agencies were included, but it was $28,725 when the cost data from agencies with the lowest and highest figures were
excluded. Detailed volume and geometry data were provided by the respondents for six specific intersections. Crash data
were provided for three of these six intersections. Each of the three intersections exhibited a crash reduction, but the
sample size was too small for statistical testing. The observed ASCT cost per intersection per annual crash reduction was
computed for the three intersections, and it ranged from $5,444 to $37,500. The scope of this study was very limited; thus,
only very limited conclusions could be drawn. The limited data seem to indicate that there are safety benefits for
implementing ASCT. It is recommended that a controlled experiment of ASCT implementation in Illinois be conducted to
determine benefit–cost ratios and compute a crash modification factor (CMF).
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