Citation

Evans DD. Transp. Res. Circular 2006; (E-C098): 103-113.

Copyright

(Copyright © 2006, U.S. National Academy of Sciences Transportation Research Board)

DOI

unavailable

PMID

unavailable

Abstract

The Ohio Department of Transportation (ODOT) has initiated a process to create a system that detects, records, reports, and disseminates informational data regarding low grip areas on roadway surfaces. A Road Grip Tester (RGT) system measures road surface friction by utilizing an existing hydraulic system to deploy and retract a wheel that is located in the front of the drive axle underneath the vehicle or using a wheel mounted to a tow hitch at the rear of the vehicle. In normal, dry conditions a graphical display in the cab of the vehicle will show green lights (along with a corresponding numerical value). As the surface loses friction (e.g., wet or snowy conditions), more lights are displayed and the color changes from green to yellow; the numerical value changes (decreases) as well. As the road becomes snow covered, even more lights are displayed and the color changes to red. The numerical value decreases even further. The intent of the system is to serve as an early alert and advance notification system for road conditions before, during, and after a winter event. The RGT provides the ability to detect deteriorated pavement surface conditions associated with winter weather that are otherwise not visibly evident. The system provides information allowing ODOT maintenance forces to detect the presence of black ice on pavement surfaces and prompt immediate treatment where needed. It also provides real-time information to detect the rapidly changing conditions associated with winter maintenance activities.