Abstract
The frequency, nature and causes of vehicle encroachments on medians of divided highways were investigated to obtain inf ormation needed in establishing traffic safety criteria for median width and cross section design. The effects of median width and cross section, traffic volume, roadway alignments, wheater, roadside signs, grade separation structures and other features of the highways and driving environment were considered. Relationships between traffic volume and the frequency and nature of vehicle encroachments on medians are presented. The recommendations include minimum design requirements for safe stopping or control of vehicle in the median.