The study reviews delineator spacing intervals of 40, 80 and 160 feet placed along median barrier divided roadways. Optimum spacing of the delineators was determined by having observers view film of several installations. Spacings of delineation were considered undesirable when, in the raters' opinions, the delineators provided an inadequate amount of information to serve effectively as an aid for nighttime driving. Primary considerations for driver information were the ability to detect the path of the road ahead and the lateral location of the barrier. Reducing spacing distances were identified for specific geometric situations. Based on the costs of installation, the impacts on maintenance and the desirable spacing, delineators should be spaced at 80 feet in general and 40 feet whenever engineering judgment indicates an additional need for delineation.
Center Barrier Delineator Spacing Study
1988
52 pages
Report
Keine Angabe
Englisch