This study examined vehicle interaction with various roadside features to determine key roadside-feature design criteria based on their potential for inducing vehicle rollover. The highway-vehicle object simulation model (hvosm) computer program was used in the study to determine dfferences between large and small vehicles and their performance capabilities with regard to various roadside features. The hvosm was modified to improve its application to rollover situations. The results of the study are presented and discussed. The tests showed that 3:1 slopes are only marginally safe for traversal by small, lightweight automobiles. Ditches with front slopes no steeper than 3:1 appear relatively safe. these and other study results are discussed.
Abstract