The following purposes served by a transition curve in a highway alignment include:
1. Gradual introduction of the centrifugal force on moving vehicles from zero on the straight alignment to a constant final value on the circular curve.
2. Enabling the gradual introduction of superelevation on the roadway.
Select the correct answer using the codes given below:1
1 only
2
2 only
3
Both 1 and 2
4
Neither 1 nor 2