Safety research : heavy vehicles, information systems, and crash studies and methods. A peer-reviewed publication of the Transportation Research Board TRB.

Research on several aspects of highway safety is presented in this Record. Heavy vehicles continue to pose a safety concern and prompt research. The first four papers cover structural geometric design, commercial driver, and accident countermeasure research related to heavy vehicles. Then driver licensing manuals are examined from the perspective of traffic engineering. Variable message signs are evaluated from a driver's perceptual point of view, high-speed isolated signalized intersections are studied, and motorists' understanding of left-turn signals and auxiliary signs is assessed. The total station approach to incident management is discussed. The effect of intersection congestion on accident rates and ways to estimate accident rates are studied, and a health department that identified dangerous highway locations is reported. Finally, development of a quantitative measure of traffic conflicts is described.