Highway Engineering
For design, that length of transition curve should be taken which is

based on rate of change of super elevation
smaller of (A) and (B)
based on allowable rate of change of centrifugal acceleration
higher of (A) and (B)

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

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