What do these motorway signs show?

A: They're countdown markers to a bridge

B: They're distance markers to the next telephone

C: They're countdown markers to the next exit

D: They warn of a police control ahead

The exit from a motorway is indicated by countdown markers. These are positioned 90 metres (100 yards) apart, the first being 270 metres (300 yards) from the start of the slip road. Move into the left-hand lane well before you reach the start of the slip

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