United States Department of Transportation
i
Multi-Modal Intelligent Traffic Signal Systems (MMITSS) impacts assessment.
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2015-08-01
[PDF-4.94 MB]
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Abstract:The study evaluates the potential network-wide impacts of the Multi-Modal Intelligent Transportation Signal System
(MMITSS) based on a field data analysis utilizing data collected from a MMITSS prototype and a simulation analysis.
The Intelligent Traffic Signal System (I-SIG), Transit Signal Priority (TSP), Freight Signal Priority (FSP), and the
combination of TSP and FSP applications were evaluated. MMITSS seeks to improve mobility through signalized
corridors using advanced communications and data to facilitate the efficient travel of passenger vehicles, pedestrians,
transit, freight, and emergency vehicles through the system. The field data analysis demonstrated that MMITSS
applications effectively improved the travel time and the delay of the equipped vehicles. In particular, FSP reduced the
delay of connected trucks by up to 20% and I-SIG improved travel time reliability by up to 56%, compared to the base
case. The simulation study found that I-SIG achieved vehicle delay reductions up to 35% and TSP effectively saved
travel time for both transit and passenger vehicles on the corridor where TSP was operated; but occasionally increased
the system-wide delay, due to reduced green times on the side streets. FSP simulation results indicated that FSP
successfully reduced travel times for connected trucks, but also increased system-wide delay, due to increased delays
on side streets. The simulation study found that the combination of TSP and FSP applications was effective in
assigning priority to trucks based on a pre-defined hierarchy of control. The study concludes that the MMITSS I-SIG,
TSP, FSP, and the combination of TSP and FSP applications improve vehicle travel time, delay, and travel time
reliability for equipped passenger cars, trucks, and transit vehicles on the test facility, but the tradeoff is that it may
produce overall system-wide negative impacts.
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