Discussion
As speed increases, longitudinal friction coefficient:
Answer: A
As speed increases, the longitudinal friction coefficient Decreases.
At higher speeds the tyre has less time to grip the micro-texture of the pavement and, on wet roads, a film of water builds up under the tyre, so the available friction falls. IRC therefore uses longitudinal friction coefficients of about 0.35 to 0.40 for stopping sight distance, the lower values for higher design speeds.
Friction does not stay constant or rise with speed; that is why stopping distances increase faster than speed itself.
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