This paper describes how accident data and travel data can be combined to provide a basis for setting priorities and evaluating safety effects of new vehicle-based roadway illumination specifications. Methods for making distinctions between daylight and darkness are applied to both accident tabulations and vehicle miles of travel tabulations. Exposure-based accident rates are calculated for several types of accidents and roadways. Measures for improvements in safety are discussed in terms of reductions in nighttime exposure-based rates as related to improvements in visibility of signs, road markings and general aspects of the roadway environment. (A) For the covering abstract of the conference, see IRRD 837684.
Abstract