The correct answer is A. 6.
A conflict point is a point where two or more vehicles can potentially collide. On a right angled road intersection with two way traffic, there are 6 conflict points:
- 2 at the entrance to the intersection from each direction
- 2 at the exit from the intersection to each direction
- 1 at the center of the intersection
The other options are incorrect because they do not account for all of the conflict points. Option B, 11, is the number of conflict points if there is only one way traffic in each direction. Option C, 18, is the number of conflict points if there is two way traffic in each direction and the intersection is not right angled. Option D, 24, is the number of conflict points if there is two way traffic in each direction and the intersection is not right angled and there is a median in the middle of the intersection.