Highway Engineering
The entrance and exit curves of a rotary have

equal radii and equal widths of pavement
equal radii but pavement width is more at entrance than at exit curve
equal pavement widths but radius is more at entrance curve than at exit curve
different radii and different widths of pavement

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Highway Engineering
The provision of traffic signals at intersections

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
reduces right angled and rear end collisions

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