Highway Engineering
The direct interchange ramp involves

diverging to the left side and merging from left
diverging to the right side and merging from left
diverging to the right side and merging from right
diverging to the left side and merging from right

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Highway Engineering
The provision of traffic signals at intersections

reduces right angled and rear end collisions
reduces rear end collisions but may increase right angled collisions
reduces right angled collisions but may increase rear end collisions
increases right angled and rear end collisions

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