Difference between revisions of "Talk:233.2 At-Grade Intersections with Stop and Yield Control"
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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. | 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 | + | 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 chart (listing minimum SSD, minimum entering sight distance and design sight distance) will have to clearly define that the entrance and the SSD distances are calculated differently from one another (one using the 2' object height and the other using 3.5'). |
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Revision as of 15:08, 14 January 2009
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 chart (listing minimum SSD, minimum entering sight distance and design sight distance) will have to clearly define that the entrance and the SSD distances are calculated differently from one another (one using the 2' object height and the other using 3.5').
