Recommended Laboratory Test for Predicting the Initial Retroreflectivity of Pavement Markings from Glass Bead Quality
Project Data
Funds:
$349,990
Research Agency:
Iowa State University
Principal Investigator:
Omar Smadi
Effective Date:
6/25/2009
Completion Date:
11/30/2012
Comments:
The project final report is available as NCHRP Report 743.
The objective of this project was to develop a proposed laboratory test to predict the initial retroreflectivity of pavement markings in the field based on the quality of the glass beads. The test would be rapid (i.e., preparation and testing complete in 24 hours or less); repeatable and reproducible; cost-effective; practical (i.e., suitable for routine use in a state materials testing laboratory); and verified and validated through measurements of the initial retroreflectivity of pavement markings applied in the field.
