- The wheel base of the vehicles is rigid and therefore while taking the turn, only front wheel are able to change direction. Path traveled by the front will be different and will be at certain distance outwards from the path traced by the inner wheel. This can be understood with the help of the diagram and image shown below.
Extra widening on horizontal curves
- There is a tendency of the driver to take the outer path at the curves to have more sight distance visible ahead.
- While overtaking operations on horizontal curves driver will need more spacing from the other vehicles to feel safer.
|Horizontal curve on a hilly road (Gocind Sagar view point-Himachal Pradesh)|
|IRC recmmended values for the Extra widening of pavement on Horizontal curves|