Mud on the road – irresponsible farmers

Living in a rural area provides some great riding experiences, but the one thing I really hate at this time of year is the amount mud deposited on the roads from tractors. Its bad enough in the wet when it becomes a mud bath, but if allowed to dry the deposits are potential hazards to anything on two wheels (I’ve almost come a cropper on more than one occasion).  A quick Google reveals that under the Highways Act 1980 it is an offence for farmers (or anyone else for that matter) to deposit mud and other things on the highway (S148), which could result in prosecution and a fine.   Given that this is a regular occurrence where I live, the tractors clearly aren’t being cleaned properly as they should before taking to public roads, but I wouldn’t even know where to begin with regards raising it with someone.  Anyone else ever had this problem?