THE police are appealing for help tracing a person who threw a supermarket shopping trolley from a bridge onto the M4 motorway this morning damaging two vehicles near the Pucklechurch Road overbridge.

At least two vehicles hit the trolley and were damaged at around 1.15am on the eastbound section between junctions 18 and 19, near the Pucklechurch Road overbridge on the B4465 Westerleigh Road.

Traffic officer PC Mark Lambert said: “This constitutes a serious risk to life and anyone who has information or has seen anything that may be linked is urged to contact police.”

If you can help, you are asked to call 101 quoting reference 40 of April 27.