McGee Sr, Hugh W.'s Geometric Design Practices for Resurfacing, Restoration, and PDF

By McGee Sr, Hugh W.

ISBN-10: 0309143330

ISBN-13: 9780309143332

ISBN-10: 1621982556

ISBN-13: 9781621982555

Every one nation transportation service provider has its personal layout tips and criteria for nonfreeway resurfacing, recovery, and rehabilitation (3R) tasks. those contain improvements to enhance road safeguard. the aim of this learn used to be to assemble and synthesize present country practices relating to 3R initiatives. details was once obtained via a literature assessment and a survey of all kingdom transportation organizations. files that supply kingdom 3R guidelines have been acquired both from nation web content or at once from the states.

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Bridges are usually designed to accommodate either an H-15 or HS-20 loading. An H-15 loading is represented by a two- 25  axle single-unit truck weighing 15 tons with 2 tons on its steering axle and 12 tons on its drive axle. An HS-20 loading is represented by a three-axle semitrailer combination weighing 36 tons with 4 tons on its steering axle, 16 tons on its drive axle, and 16 tons on the semitrailer axle. The “20” is 20 tons for the 4 tons on steering axle and 16 tons on the drive axle. The “S” stands for semitrailer combination, which adds in the additional 16 tons for the third axle to give a total of 36 tons.

6. Highway agencies should increase the superelevation of horizontal curves when the design speed of an existing curve is below the running speeds (85th percentile speed is to be used for this comparison) of approaching vehicles and the existing superelevation is below the allowable maximum specified by AASHTO new construction policies. Highway agencies should evaluate reconstruction of horizontal curves when the design speed of the existing curve is more than 15 mph below the running speeds of approaching vehicles (assuming improved superelevation cannot reduce this difference below 15 mph) and the average daily traffic volume is greater than 750 vehicles per day.

For non-NHS highways, there are no set clear zone width values. The mountainous terrain of West Virginia makes it difficult to provide a clear zone. It is acknowledged that a policy that requires a statewide uniform clear zone distance would be neither practical nor effective. Side slopes are relevant to the provision of clear zone; hence, several states refer to the need for flattening steep side slopes. Florida’s guidance on side slopes is listed below: Front slopes: Clear Zone and Side Slope 1.

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Geometric Design Practices for Resurfacing, Restoration, and Rehabilitation - A Synthesis of Highway Practice by McGee Sr, Hugh W.


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