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Analysis of Using V2X DSRC-Equipped Snowplows To Request Signal Preemption
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2022-07-01
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[PDF-2.97 MB]
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Edition:Final Report Oct. 2019 to July 2022
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Abstract:For the 2019-2020 winter season, vehicle-to-everything (V2X) systems using dedicated short-range communications (DSRC) were placed on Utah Department of Transportation (UDOT) snowplows and state routes to test the effectiveness of snowplows requesting signal preemption from traffic controllers. This study was done to understand the impacts and benefits of using signal preemption with snowplows. There were five corridors throughout the Salt Lake metropolitan area that had roadside units (RSUs) deployed. Analysis was divided into traffic signal and snowplow and vehicle efficiency impacts. Results were analyzed for the system overall, by the different routes, and were compared to similar not-equipped routes. For the traffic signal analysis, it was found that the system is being used often, with snowplows requesting preemption over 50 percent of the time they approached a signalized intersection. Of those requests, signal controllers granted preemption over 80 percent of the time. On average, this affected the signal controller phasing and its return to coordinated status for less than 5 minutes. For vehicle performance analysis, traffic on equipped routes traveled at speeds closer to the associated posted speed limits when compared to corresponding not-equipped routes. Vehicle crash data showed that there was a greater decrease in crashes on equipped routes than not-equipped routes. Snowplows also stopped fewer times due to requesting signal preemption. Anecdotal evidence from snowplow drivers indicates a benefit to overall operations on corridors equipped with the V2X system.
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