All the geometric design features of highway such as horizontal and vertical alignment, super elevation, sight distance and grades are affected by speed of vehicle. Terrain, traffic volume and the anticipated posted speed must be considered when establishing a roadway's minimum horizontal curvature. Width of a traffic lane depends on the width of the vehicle and the clearance. The maximum permissible width of a vehicle is 2.44 m. The maximum height and length of vehicle is limited by IRC is 4.75 m and 18 m respectively.