Eagle-eyed social media users had been discussing what could possibly be behind the partially hidden door.
A woman who had been traveling with her partner along the M6 recently photographed something unusual in the sky.
Over the last 50 years, one of England's major roads has had its fair share of mysterious occurrences.
One stretch of the M6 motorway in England has gained something of a haunted reputation in recent years.
A recent road accident in Poland saw a tanker truck full of liquid chocolate overturn, spilling its cargo everywhere.
A puzzled motorist recently recorded footage of a riderless motorcycle cruising along a French motorway.