Chaos on the roads yesterday saw a build-up of traffic after a coach collided with other vehicles near the slip road (Westbound) on junction 10 of the M4.

Miles behind near junction 4 and 4B of the M4 motorists were encountering another problem.

Dozens of vehicles had reportedly hit a pothole and were left stranded on the now smart motorway.

One passenger said she was in the car heading westbound when she encountered a pothole on the M4 westbound just after junction 4B.

"We were returning from Gatwick and there was a horrific bang as my daughter drove through a massive pothole.

"We pulled to the side of the motorway in the dark and went to join many other cars, most of which had sustained flat tyres."

The family were left "extremely shaken".

READ MORE: National Highways statement after dozens encounter pothole

At around 8:30pm a second motorist said they encountered the pothole but their tyres survived.

They reported seeing 15 cars on the verge and no police or highway patrol present.

"The refuge lay-by was full with four cars and we nearly hit a car stationary in the left-hand lane.

"There was a 50-mile-an-hour warning but no lane closure at that time. Horrendous, very relieved to get home safely."

Another motorist reported seeing a lane closure sign and '20 cars all lined up with flat tyres' on the M4 near Heathrow Airport later in the evening.