Sent a four page list plus map, detailing every hole/surface defect that I passed to the local council in 2003.
Some of these are still waiting to be fixed. Some were disputed by the council as not being within the council boundary. Corrected them with an OS map, which they still have, showing the boundary.
What you need is a sign on the back which say
"ROAD SURVEYING. Warning this vehicle may stop at any time"