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Advanced LED warning system for rural intersections : phase 2 (ALERT-2) : final report.
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2014-02-01
[PDF-6.52 MB]
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Edition:Final report
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Abstract:This report presents findings of the second phase of the Advanced LED Warning System for Rural
Intersections (ALERT) project. Since it is the next generation of the same system, the second phase
system is referred to as the ALERT-2 system while the first system is referred to as the ALERT-1 system.
The ALERT systems demand use of four basic Intelligent Transportation Systems (ITS) technologies:
LED-based signs, renewable energy, non-intrusive sensors, and wireless communication. Use of these
four basic technologies remained the same for both phases of the system. In the first phase, the data
showed that the ALERT-1 system reduced vehicle speeds on the main approach, increased STOP wait
time on minor approaches, and eliminated roll-throughs for vehicles on minor approaches when a conflict
existed in the intersection. However, when no conflict exists in the intersection, an increase in rollthroughs
for vehicles on the minor approaches was observed. The ALERT-2 system was redesigned to
mitigate this increased roll-throughs. With respect to technological advances, the ALERT-2 system
improves many aspects of the basic technologies, providing higher system reliability, easier installation
and maintainability, and better self-sustainability through redesign of the renewable energy application.
To assess the driver behaviors at the test site, 13 moths worth of video data and a survey of local residents
were collected. This report describes the system development, implementation, and analysis of the video
and survey data.
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