A-road junction roundabout sign
A green sign with a diagram showing a roundabout at a three-level stacked roundabout interchange with the following text.
Left turn destinations: Heathrow [Airport symbol]; Watford (M1); Junction 23 M25 [Solid diamond diversion symbol].
Right turn destinations: (M20), Dartford; Stansted (M11) [Airport symbol]; Potters Bar; Junction 23 M25.
Change Route: M25 Watford or M25 Stansted
There are actually six arms to this enormous multi-lane roundabout: to the top right is the access for South Mimms services and the village of the same name; to the bottom right is the A1081 towards Barnet.