Grooved Stripes for Plow-Resistant Wet-Night Lane Delineation. Phase II. Recessed Reflector Delineation.

摘要

Different combinations of groove geometry and paint treatments were installed to evaluate their wet-night visibility. The results indicated that only a recessed reflector system was more visible than conventional beaded paint stripes from a moving vehicle. This report details a third stage,which consisted of placing 105recessed reflectors on an operational highway to identify installation problems,the amount of delineation provided,and possible maintenance problems. Evaluations consisted of wet-night visibility surveys,system condition surveys, telephotometer measurements,and subjective evaluations. After 1year of exposure to traffic and snow-and-ice control operations,all reflectors are functioning. Delineation,which depends on the reflector's sight distance and target value,varies from excellent to poor. Glare on the pavement reduced the target value of reflectors along one section of roadway and contributed to poor delineation.