If a two-lane national highway and a two-lane state highway

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If a two-lane national highway and a two-lane state highway intersect at right angles, the number of potential conflict points at the intersection, assuming that both the roads are two-way is

1. 11
2. 17
3. 24
4. 32

Correct Option: C

No. of conflict points in 2 way 2 lane = 24