The Traffic Accident Reconstruction Origin -ARnews-
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Re: Sight Distances
Ed Phillips (edphill@aol)
Mon, 19 Oct 1998 22:12:49 -0400 (EDT)
Mr. Gorski is correct. Measure the sight distance and compute stopping distance from the characteristics of the roadway. AASHTO is a good source, but many States have their own Traffic Manuals that set criteria for Design and Operational engineering. It is omportant to note that a Design criteria applies to a roadway that is built from the dirt up, not an operating road that may have evolved over the years. Also, a road may have met design standards when it was built, yet fall outside of the current standards.
Dip sections are a common occurence and a driver is required to adjust his/ner speed to adapt to the apparent surrounding roadway conditions.
Contact your State DOT to obtain the TE Manuals you desire. P.S. - In most States you require special education or licensing to speak to expert opinions as to roadway Traffic Engineering and Signing.
Ed
Ed Phillips
edphill@aol
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