Design policies for sight distance at stop-controlled intersections based on gap acceptance

摘要

The current AASHTO policy for sight distance at stop-controlledintersections is based on a model of the acceleration performance ofa minor-road vehicle turning left or right onto a major road and thedeceleration performance of the following major-road vehicle. Thispaper develops and quantifies an alternative intersection sightdistance model based on gap acceptance. The paper describes fieldstudies that were performed to determine the critical gapsappropriate for use in sight distance design. It is recom- mendedthat the sight distance along the major road for a passenger car at astop-controlled intersection be based on a distance equal to 7.5 s oftravel time at the design speed of the major road. Longer sight dis-tances are recommended for minor-road approaches that have sufficienttruck volumes to warrant con- sideration of a truck as the designvehicle.