600-176Section 629 — Mobile Evaluation of Retroreflectivity
629.1Description
1 Evaluate the retroreflectivity of the pavement markings as specified.
629.2Material
1 None specified.
629.3Construction
1 Within 20 days of initial application, arrange for an independent party to evaluate the retroreflectivity of the pavement markings using a mobile retroreflectometer using a 30-m CEN geometry that can collect data at highway speeds , such as the Delta LTL- M or equivalent. Conduct a second evaluation within 20 days before the end of the 180- day observation period. If the permanent markings are snowplowed during the 180- day observation period, ensure that the lines meet the minimum retroreflectivity values shown in the table below at the time of the second evaluation. Material Description Color Initial Reading 180 Reading Snow Plow Reading Thermoplastic – Single Drop Beads White Yellow 375 250 325 200 200 150 Thermoplastic – Double Drop Beads White Yellow 450 350 400 300 200 150 Fast Cure Epoxy White Yellow 450 350 400 300 200 150 Slow Cure Epoxy White Yellow 800 500 700 400 375 250 Polyurea White Yellow 800 500 700 400 375 250 Preformed Tape White Yellow 800 500 700 400 N/A N/A Single Component Hybridized Polymer White Yellow 375 250 325 200 200 150 Profiled Thermoplastic White Yellow 375 250 325 200 200 150 Rumble Stripes White Yellow 375 250 325 200 200 150 Permanent Pavement Markings White Yellow 400 300 350 250 200 150 2 For non-interstate or non-c ontrol of ac cess routes, measure all long lines in the direction of trav el. For two-l ane roadways, ensure that the independent party evaluates the center line markings in the direction of marking application if