Talk:233.2 At-Grade Intersections with Stop and Yield Control

The minimum sight distance for at-grade intersections, entrances, and median openings, measured along the centerline of the main road, is equal to the Entering Sight Distance based on the operating speed of the main road. This distance is based on a 3.5 ft. (1070 mm) height of eye and 3.5 ft. (1070 mm) height of object. The minimum sight distance at all grade intersections measured along the minor road, is the stopping sight distance based on the operating speed of the minor road.

IS THE HEIGHT OF OBJECT REALLY 3.5? The Stopping sight distance height of object is 2, under Driveway and entrances, the entering sight distance is 2.

If this is the case for the 3.5' height of object, the vertical curves will have to be manually calculated instead of using geopak. Also, if this is the case, the below chart will have to define this because most people will utilize geopak to create a curve until they get the desired results from the SSD output.