Highway Engineering
The method of design of flexible pavement as recommended by IRC is

Benkelman beam method
group index method
Westergaard method
CBR method

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Highway Engineering
The provision of traffic signals at intersections

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

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