chapter7 - CE222 Highway Engineering Notes for Chapter 7...

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CE222 Highway Engineering Notes for Chapter 7 Geometric Design of Highways Design Standards: Design standards and procedures vary from state to state. Federal Aided highway projects should follow ASSHTO standards. Factors affecting Highway Design: Functional Classification of the roadway Projected traffic volume and composition Required design speed Topography of the surrounding land Capital costs for construction Agency funding mechanisms Human sensory capacities of roadway users Vehicle size and performance characteristics Traffic safety considerations Public involvement, review, and comment Environmental consideration Right-of-way impacts and costs In detail, the following factors are directly related to the design of new roadway: Average Daily Traffic (ADT) Design Hourly Volume (DHV) Directional Distribution (D) Percentage of trucks (T) Design Speed (V) Design Vehicles All the above factors reflect the demand side of the highway facility to be built. They indicate the measurements that the new facility (after built) should
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chapter7 - CE222 Highway Engineering Notes for Chapter 7...

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