A safety evaluation of current stopping sight distance design criteria. Paper presented at the 49th Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1970.

The study reported here was conducted in response to an increasing concern by highway design engineers regarding the validity of current stopping sight distance standards. The evaluation considered the criteria employed in developing the standards including: driver perception, reaction time; design friction factors; assumed speeds for design; driver's eye height and object height.