Abstract
seventeen full-scale vehicle crash tests were conducted to evaluate single-post roadside signs such as milepost markers, route markers, and destination, stop, and one way signs. Some of the signs were equipped with breakaway devices such as treaded pipe couplings and multi directional slip bases. Other signs were mounted on delineator pots and small-diameter pipe that bent down on vehicle impact. The test vehicles were towed into the signs at nominal impact speeds of 30,46, and 60 mph. Recommendations are made to minimize or eliminate some potentially hazardous secondary collisions of the signs with the vehicle's windshield and roof.