Runway Friction Index

It is so useless we don't put it on the ATIS anymore

It's useless because pilots don't know what the number means, or what to
do about it. Pilots aren't told what it means because it's not much
used. It's not much used because...

So... what do the numbers correspond to? That is, if I hear a mu of 33,
what can I expect?

Jose
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