Alignment: - The position occupied by centerline of a road in plan is called alignment.

Requirements of an ideal road alignment:-

1) Short: - In between two terminal station the alignment should be as short as possible. It should provide economy in the cost of construction and maintenance.

2) Easy: - The alignment should be easy for the operation of vehicles with easy gradients and curves.

3) Safe: - The alignment should be safe for traffic operation.

4) Economical: - The alignment should be economical in its cost of construction, maintenance & traffic operation.

5) Utility: - The alignment should provide maximum utility by connecting important towns and group of villages.

6) Natural aspects: - The alignment should pass through regions of natural beauty and scenery to have good natural aspects.