Design of Horizontal Alignment:
Various design element to be considered in the horizontal alignment are:
- Design speed
- Type and length of transition curve
- Width of pavement
- Super elevation
- Radius of circular curve
- Set back distance
Design Speed:
- The design speed is main factor on which most of the geometric design element depends including horizontal elements.
- The design is speed of road depends, upon class of road and terrain.
- Classification of terrain & design speed for different class of road is as follows:
- Design speeds are also being defined for urban roads.
- Two values of speed is ruling and minimum are being specified for each type of Road.
- As far as possible, attempt most to be made to design all the geometric element for ruling speed however it site conditions and economic consideration does not permit so, design must be done for minimum design speed.
For Detailed Analysis of Highway Engineering Step By Step.