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Audible Lane Departure Warning for Seal Coat Surfaces

Project Summary

In an effort to reduce the number of single vehicle run-off-road and two-lane two-way crossover crashes TxDOT has implemented various audible lane departure warning systems on seal coat road surfaces. These audible lane departure warning systems are typically profiled pavement markings, but have recently included rumble bars. These countermeasures are typically used on seal coat road surfaces where milled rumble strips cannot be utilized or on roadways where shoulders are too narrow for milled rumble strips. These treatments are used on concrete and asphalt surfaces as well. Currently contractors and material producers are using slightly different designs to meet current specifications which may yield varying levels of performance. The research team will review different Spacing criteria and combinations of treatments. The effectiveness of these treatments from a cost/benefit, safety, increased wet-night visibility, sound level, and vibration level standpoint will also be evaluated.

Project Number

0-6888

Status

Completed

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