Motorway fork sign
A blue sign with a diagram showing a branch off the road ahead and the following text.
Forward destinations: (M20, M11, M1); Dartford Crossing; Stansted [Airport symbol]; C. London.
Exit destinations: London (SE); Bromley; A21; Orpington; (A224) [Hollow square diversion symbol].
Junction number: 4.
This junction is surrounded by wooded slopes, part of the deliberate efforts made to screen the motorway from its surroundings. Even where it runs on an embankment above ground level, it's placed in a fake cutting with slopes on either side to hide it from view.