Test: Highway Alignment

The changes in gradient and vertical curve are covered under the vertical alignment, whereas the remaining three are covered under horizontal alignment.

The increase of population does not depend on the alignment of the road, whereas improper construction and maintenance lead to accidents.

The alignment of the road should be short, safe, easy and economical for users and engineers

 The most economical option is to provide a road around the hill. In this alternative approach is not advisable as it has to pass either through the hill or nearby the hill.

 The obligatory points through which alignment should not pas include religious structures and costly structures because destroying them would require a lot of compensation.

The desire lines are lines which study the traffic flow from origin and destination.

The most preferred type of road is bituminous roads. They are cheap for initial construction when compared to other type of surfaced roads.

The slope stability is important during design of hill roads ,because it may have a danger of landslides.

The coefficient of lateral friction recommended by IRC is 0.15 and it lies between 0.3-0.4 for longitudinal friction.

The resisting length should be kept as low as possible for gradient purposes, if it is maximum then there will be a problem with the gradient.