A blue sign with a diagram showing a branch off the road ahead and the following text.
Forward destinations: London (C) A1.
Exit destinations: (M1); Heathrow [Airport symbol]; Watford; Stansted [Airport symbol]; Potters Bar; M25; Barnet; A1081.
Junction number: 1.
Change Route: M25 Stansted & Watford
Exit here for the chance to experience the infinite orbit of London in any direction you choose, or stay with the A1 to plough on to the North Circular.