Motorway fork sign
A blue sign with a diagram showing a branch off the road ahead and the following text.
Forward destinations: (M11, M1); Dartford Crossing; Stansted [Airport symbol].
Exit destinations: London; Lewisham; A20 [Hollow circle diversion symbol]; Channel Tunnel; Maidstone; M20.
Junction number: 3.
As we cross over the top of this junction, you might notice the bridge carries three lanes of traffic but has no hard shoulder. It was built in 1977 (along with the next section of motorway, from J3 to 2) when ambitions for this road were smaller and only two lanes were expected to cross it.