Quite a few Runway excursions recently have been attributed to quickly changing surface friction conditions on the runway. e.g.
Trans States E145 at Rochester on Feb 22nd 2012
I was wondering, are there any products (or could there be feasible) that would more dynamically give a runway surface friction measurement? The spatial non-uniformity of surface must also be a factor, so not an easy task I guess. But wondering what's out there and would it help?