1) Obligatory points.

(i) points through which alignment is to pass

(ii) Points through which the alignment should not pass.

2) Traffic: The new road to be aligned should keep in view desire lines, anticipated traffic flow, classified traffic volume, their growth and future trends.

3) Geometric design: Factor such as gradient, radius of curve& sight distance also would govern the final alignment of highway.

4) Economics: The various factors are considered as

a) Initial construction cost

b) regular & periodic maintenance cost of the road.

5) Other considerations: which may govern either the horizontal or vertical alignment of road are drainage considerations.