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Project Information
Project ID:   FHWA-PROJ-10-0068
Project Name:   Pavement Friction Thresholds
Project Status:   Temporarily Suspended
Start Date:  November 22, 2010
End Date:  August 28, 2017
Contact Information
Last Name:  Sherwood
First Name:  James A
Telephone:  202-493-3150
E-mail:  jim.sherwood@dot.gov
Office:   Office of Infrastructure Research and Development
Team:   Infrastructure Analysis and Construction Team [HRDI-20]
Program:   Innovative Pavement Research and Deployment
Project detail
Roadmap/Focus area(s):   Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:   In phase I, the contractor performed a literature review on pavement friction and macro-texture and safety. They wrote a report on theoretical vehicle, tire, and pavement interactions as they relate to skid crashes in order to recommend the best equipment to measure friction and macro-texture. In phase II, the contractor will use the recommended equipment (purchased by Federal Highway Administration) in four States to test about 700 sites to develop Pavement Friction Thresholds and Management Programs.
The key project objectives are:
(1) Perform tests and analyses to determine criteria, and develop methods to establish investigatory  levels for friction and macro-texture, for selected State Department of Transportation (DOT) agencies.
(2) Assist four State DOTs to develop "Pavement Friction Management Programs."
(3) Demonstrate state-of-the-art continuous friction measurement equipment (CFDME.)
Field Test:   The contractor will test the friction and macr-otexture of a variety of pavement types, to develop and demonstrate thresholds values as part of Pavement Friction Management Program.
Test Methodology:   We got stakeholder input for the recommended continuous friction measurement equipment, i.e. a Sideways Coefficient Routine Investigation Machine (SCRIM), procure a machine, and use it in field tests to predict crash histories.
Partners:   Federal Highway Administration: Office of Research, Development, and Technology - Office of Infrastructure Research and Development; Role(s): Technical
Expected Benefits:   States have found benefit-cost ratios of up to 15, based on crash reductions.
Project Findings:   Two pieces of continuous pavement friction measurement equipment were identified, for possible use in phase III, i.e. the Dynatest Highway Friction Tester,  and the Sideways Coefficient Routine Investigatory Machine (SCRIM). The Dynatest equipment uses a brake to slow down the test wheel.  The SCRIM which is the only device that has a track history of testing at least 100 miles per day, develops a 34 % slip ratio by angling the test tire at 20 degrees to the direction of travel.
FHWA Topics:   Safety--Roadway Departure Safety
TRT Terms:   Friction
FHWA Disciplines:   Pavement and Materials
Subject Areas:   Highways


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