Methods for ensuring consistency of horizontal alignment elements

Abstract

On rural two lane roads, which form over 80 percent of the total road network in most countries, most accidents are caused in curves. The most frequent cause of accidents is the inconsistency of horizontal alignment elements with respect to possibility of maintaining the desired speed of travel. An overview is given of existing methods and latest research, as related to the evaluation of vehicle operation speeds, and consistency of horizontal alignment elements on rural t w o lane roads. Advantages and deficiencies of guidelines applied in individual countries are also presented.