Highway Code Rule 279
If anything falls from your vehicle (or any other vehicle) on to the road, stop and retrieve it only if it is safe to do so.
Section: Breakdowns and incidents (rules 274 to 287) Subsection: Obstructions (rules 279 to 280)Highway Code Rule 280
Motorways. On a motorway do not try to remove the obstruction yourself. Stop at the next emergency telephone and call for help.
Section: Breakdowns and incidents (rules 274 to 287) Subsection: Obstructions (rules 279 to 280)