Mu ?
 

I've been issued a req ldg field length chart where the term 0.10 Mu is used to describe a braking action of "fair or better".

How does Mu relate to braking action as used in northern europe ?

Mu is the symbol conventionally used for the 'coefficient of friction', which governs the frictional force between two bodies. Check any basic physics textbook.

2?

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What The Hell's It Doing Now?

My charts show a Mu of .10 to be nil braking. It takes a Mu of .38-.54 to be in the "fair" range and above .54 to be "good".

No matter which method is used, Bowmonk, Tapley, Saab, Skidometer, etc., any reading below .21 is to be considered Nil.

Be careful.

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