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they are as follows-
1.need of traffic
2.purpose and class of road
3.obligatory points
4.curves
5.gradient
6.sight distance
7.number of drainage crossing
8.formation bed
9.railways and river crossing
10.obstruction
11.earthwork
12.availability of labour and material
13.existing right of way
14.lenghty straight route
15.asthetical aspect
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