A four-arm uncontrolled un-signaled urban intersection of both-way traffic is illustrated in the figure. Vehicles approaching the intersection from the directions A, B, C, and D can move to either left, right, or continue in straight direction. No U-turn is allowed. In the given situation, the maximum number of vehicular crossing conflict points for this intersection is _________ (answer in integer)
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In urban traffic design, it’s important to minimize conflict points to reduce accidents and improve traffic flow. Higher conflict points often lead to more complex signalization or control systems.
Vehicular conflict points arise at intersections when vehicles navigate conflicting paths. In a four-arm uncontrolled intersection, vehicle movements include turning left, turning right, or proceeding straight.
Conflicts occur when paths for different movements cross or merge.
For each approach (A, B, C, D), the following conflicts exist:
A to B: Straight-moving vehicles from A conflict with left-turning vehicles from B = 1 conflict point.
A to C: Straight-moving vehicles from A conflict with left-turning vehicles from C = 1 conflict point.
B to C: Straight-moving vehicles from B conflict with left-turning vehicles from C = 1 conflict point.
B to D: Straight-moving vehicles from B conflict with left-turning vehicles from D = 1 conflict point.
C to D: Straight-moving vehicles from C conflict with left-turning vehicles from D = 1 conflict point.
Left turns from approaches A, B, C, and D can also conflict with each other.
The total number of conflict points represents the maximum number of intersecting paths.
Conclusion: The maximum number of vehicular crossing conflict points is 16.
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