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@el_presidente
I'm not a biker, but I was driving on the M25 horrible concrete section around the M3 & A3 junctions, in the anticlockwise inside lane there are huge grooves going parallel to the direction of travel which are only partially filled. These things seem to be 5 or 8 cms across and the same deep, they were unsettling my Mini when crossing and I can see them being utterly lethal to bikers, especially when wet and/or dark. Be careful!