Fair and valid points Spitoon, and yes regarding Bristol - I think you are correct with that!
However, whilst the current methods of assessing braking action remain unreliable how else are you supposed to provide the information? It certainly provokes interesting discussion. Does anyone know if a device is being researched which would allow accurate assessments on wet runways?
I do not feel I have enough experience in the field to comment on the why's and wherefore's - other than to say I can see both sides of the argument.
-HD-