A 4° curve is to be designed on a highway with two 12-ft lanes and a design speed of 60 mi/h. A maximum superelevation rate of 8% has been established. The normal drainage cross-slope on the tangent is 2.5 %. The angle of deflection for the original tangents is 37°, and the P.I. is at station 1,200 ft. The segment has a two lane cross section. 1. What is the closest any roadside object may be placed to the centerline of the inside lane of the roadway 2. Is it recommend to used Spiral transition curves for safety benefit? 3. If spiral is necessarily introduced, determine • The length of the spiral
A 4° curve is to be designed on a highway with two 12-ft lanes and a design speed of 60 mi/h. A maximum superelevation rate of 8% has been established. The normal drainage cross-slope on the tangent is 2.5 %. The angle of deflection for the original tangents is 37°, and the P.I. is at station 1,200 ft. The segment has a two lane cross section. 1. What is the closest any roadside object may be placed to the centerline of the inside lane of the roadway 2. Is it recommend to used Spiral transition curves for safety benefit? 3. If spiral is necessarily introduced, determine • The length of the spiral
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A 4° curve is to be designed on a highway with two 12-ft lanes and a design speed of 60 mi/h. A maximum superelevation rate of 8% has been established. The normal drainage cross-slope on the tangent is 2.5 %. The angle of deflection for the original tangents is 37°, and the P.I. is at station 1,200 ft. The segment has a two lane cross section. 1. What is the closest any roadside object may be placed to the centerline of the inside lane of the roadway 2. Is it recommend to used Spiral transition curves for safety benefit? 3. If spiral is necessarily introduced, determine • The length of the spiral
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