Required Stopping Sight Distance on Crest Vertical Curves
Publication: Journal of Transportation Engineering
Volume 127, Issue 4
Abstract
Required stopping sight distance (SSD), used to calculate the minimum rate of vertical curvature or the minimum length of a crest vertical curve (CVC), is usually calculated on the assumption that the grade of the braking section is zero (G = 0). This assumption is not the worst case and may lead to the selection of a CVC on which there is a segment with SSD restriction. On each CVC there are braking sections on one or both directions of travel, on which average grade is negative (G < 0). In the present paper a method for calculating required SSD, partly or wholly on a CVC, is developed, using the average grade over the braking distance. In addition, a computer program is compiled for calculating the value of the required SSD for all driver positions before or on a CVC. An SSD profile is drawn and it is proven that, for a significant length of the CVC, the required SSD is greater than the value used for calculating the minimum value of the rate of vertical curvature.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 127 • Issue 4 • August 2001
Pages: 275 - 282
History
Received: Nov 9, 1998
Published online: Aug 1, 2001
Published in print: Aug 2001
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