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

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

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Highway Engineering
A traffic rotary is justified where

number of intersecting roads is between 4 and 7
when traffic volume is more than 5000 vehicles per hour
when traffic volume is less than 500 vehicles per hour
space is limited and costly

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Highway Engineering
The provision of traffic signals at intersections

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

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