This project evaluated New Jersey Department of Transportation’s three year fixed schedule re-striping program to see if it is consistent with the actual service life of the pavement markings. One of the primary tasks was to develop a threshold value of retroreflectivity below which a pavement marking will no longer be considered “bright enough” to be useful for motorist nighttime guidance.

Two types of data pertaining to pavement markings were collected – measured retroreflectivity and subjective ratings of brightness/visibility by New Jersey drivers. Multiple regression techniques were used to relate the drivers’ ratings and the corresponding measured retroreflectivity.