Samenvatting
Two experiments were conducted under actual highway driving conditions to determine the singular and combined effects of speed impedance, distance impedance, lead vehicle speed, and traffic volume upon the acceptance or rejection of passing opportunities where sight distance is restricted by highway geometry. The results are compared with those of other investigators, and implications for highway design and traffic operations are discussed. The general results support the need for driver remedial aid systems for passing manoeuvres on rural two-lane highways.