A-road gantry sign
A gantry structure spanning the road with overhead green signs showing the left lane exiting and the other three lanes continuing ahead, and the following text.
Left lane destinations: Thurrock (Lakeside); Services A1306; Purfleet (A1090); W Thurrock (A126).
Right-hand three lanes destinations: (M11) Stansted [Airport symbol]; A13 (W & E) (M25 N).
Junction number: 31.
Thurrock services don't get much advance notice northbound, and you need to have travelled in the left-hand tunnel bore to reach them at all. The little blue patch on this sign shows you the way to find them.