Highway Geometric design presentation ppt.pptx

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1. UNI T - II Highway Geometric Design 1

2. 2 Introduction: Geometric design of a highway deals with the dimensions and layout of visible features of the highway such as horizontal and vertical alignments, sight distances and intersections. The geometrics of highway should be designed to provide efficiency in traffic operations with maximum safety at reasonable cost.

3. 3 Geometric design of highways deals with following elements: Cross section elements Sight distance consideration Horizontal alignment details Vertical alignment details Intersection elements

4. 4 a. Cross section elements Pavement surface characteristics Width of Pavement or Carriageway Cross Slope or Camber Median or Traffic Separator Kerbs Road Margins Width of Formation

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6. 6 i. Pavement surface characteristics: The important surface characteristics of the pavement are: Friction Unevenness Light reflecting characteristics Drainage of surface water

7. 7 ii. Width of Pavement or Carriageway: It is total width of road on which vehicles are allowed to move. The width of pavement depends on width of traffic lane and number of lanes. Width of lane is decided based on maximum width of heavy commercial vehicle (HCV) which is legally permitted to use the roadway.

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