Highway Engineering
If aggregate impact value is 20 to 30 percent, then it is classified as

satisfactory for road surfacing
unsuitable for road surfacing
strong
exceptionally strong

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Highway Engineering
The provision of traffic signals at intersections

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

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