Braking Coefficients COMMS

A relatively simple mark in a number of examinations, the braking coefficients are as follows:

0.4 and above - Good

0.39-0.36 - Medium to Good

0.35-0.30 - Medium

0.29-0.26- Poor to Medium

0.25 and below - Poor

Note that this coefficient is unreliable in wet snow and slush.

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When are braking coefficients/braking action considered to be unreliable?
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