United States Department of Transportation
i
Eliminating sun glare disturbance at signalized intersections by a vehicle to infrastructure wireless communication : final report.
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2016-05-01
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[PDF-2.20 MB]
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Abstract:Due to sun glare disturbances, drivers may encounter fatal threats on roadways, particularly at signalized intersections. Many studies have attempted to develop applicable solutions, such as avoiding sun positions, road geometric redirections, and wearing anti-glare glasses. None of these strategies has been able to fully solve the problem. As one of the “Connected Vehicle” practices proposed by U.S. Department of Transportation, Advanced Warning Messages (AWM) are capable of providing wireless information about traffic controls, as a supplement to conventional signs and signals, which could be somehow blocked by obstacles or natural disturbances, such as sun glare. The Drivers’ Smart Advisory System (DSAS) is a system that can provide drivers with AWM. This research explores the implications of DSAS messages on driving behaviors under sun glare disturbance using a driving simulator. Statistical analyses were applied to assess: (1) the negative impacts of sun glare, (2) the compensation of the DSAS AWM to sun glare effects, and (3) the improvement in driving performance owing to the DSAS AWM. Four performance indexes were measured: (1) half kinetic energy speed, (2) mean approach speed, (3) brake response time, and (4) braking distance. The effects of the socio-demographic factors of gender, age, educational background, and driving experience were also studied. The analytical results illustrated that the DSAS can compensate for the reduced visibility due to sun glare, and it can improve driving performance to a normal visual situation, particularly for left turns and through movements.
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