A third chimed in: "It's for night driving. When driving down that road it illuminates to basically say 'Hey, slow down, the ...

One cyclist posted on the Cycling UK Forum: "I thought I was fairly knowledgeable on road signs. However, I was completely ...

You must know what road signs mean as it will keep you safe behind the wheel and this symbol usually crops up on "dangerous" ...

You might be surprised to see this in front of you — but it's a road sign that's used around the UK ...

A third person noted: "It's for night driving. When driving down that road it illuminates to basically say 'Hey, slow down, ...

A driving test expert has explained the meaning behind this warning sign which you might come across on a 'dangerous' street.