In September, 2005 FMCSA initiated development of a prototype enhanced rear signaling system for use on commercial motor vehicles (CMVs). The system incorporates countermeasures that were developed in Phase I of this project. The system was evaluated by installing it on a test truck and by observing the behavior of drivers in real-world conditions. Based on the analysis of following driver behavior, the system showed that there are possible benefits to this system, or elements of this system, when used on CMVs. FMCSA is now considering conducting a field operational test (FOT) to further explore this system.
The countermeasures identified in Phase I include: (1) LED brake lamps with an ambient light sensor to make the lamps brighter in direct sunlight and more conspicuous in bright ambient light, (2) brake lamps that are activated by engine braking to address the increasing use of jake brakes in CMVs, (3) additional conspicuity markings that create a more accurate perception of the truck position for following drivers, (4) a sensor system that detects and tracks a following vehicle and sounds a focused audio signal and illuminates a traffic clearing lamp when the vehicle is following too closely or approaching at too high a rate of speed.
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