Date of this Version
University of Nebraska-Lincoln Spring 2017 Research Fair, Graduate Student Poster Session, April 5, 2017.
Chip sealing will reduce the depth of rumble strips (RS) by approximately 1/8". Will this depth reduction affect RS functional characteristics (audible and tactile warnings)?
There is no detailed study on the effectiveness of RS that have been chip sealed. USEFULNESS The results will be useful to the Nebraska Department of Roads to determine:
Operations: Whether RS will need to be re-milled after chip sealing. Cost & safety implications.
Design: New RS guidelines for highways expected to be chip sealed in the future.
It can be shown that a 1/8" reduction in the current milled RS design depth, as a result of chip sealing, does not result in a practical reduction in the RS effectiveness at producing audible and tactile warnings to alert drivers.
There are statistically significant differences between the in-vehicle noise levels and vibration levels when vehicles are in a travel lane (off RS) and when on a chip-sealed RS.
The difference will be clearly noticed by an average driver using a car or pickup truck at speeds of 45 mph, 55 mph, and 65 mph.