Transportation Engineering (General Engineering) (SSC JE)

As per IRC recommendations, the width of carriageway–

Camber or Cross slope–Camber on cross slopes or transverse slopes are provided in the road surface across the road length to facilitate quick flow of rain water from the road paving and parties into the side drains.

Camber as per IRC–

As per IRC–

Carriageway–The portion of the road surface which is used by the vehicular traffic is known as carriageway or roadway.
Insert image–cross section or road "Highway - Geometric design".

Webster's method of traffic signal design is an analytical approach of determining the optimum signal cycle time C.
The optimum signal cycle time–

The minimum distance available for the driver to safely overtake the slow vehicle in front of him by considering the traffic in the opposite direction is called as the overtaking sight distance.
• This distance make us see whether the road is clear to undergo an overtaking movement.

The IRC the use of the spiral as transition curve in the horizontal alignment of highway due to the following reasons.
(1) The spiral curve statistics the requirements of an ideal transition.
(2) The geometric property of spiral is such that the calculations and setting out the curve in the field is simple and easy.