Motorway gantry sign
A gantry spanning the motorway with blue overhead signs indicating two lanes exiting and two continuing ahead, and the following text.
Left-hand two lanes destinations: M25 ; (M20, M11) Dartford; (M4, M1) Heathrow [Airport symbol]; Reigate.
Right-hand two lanes destinations: M23 ; Brighton, Crawley, Gatwick [Airport symbol].
Junction number: 8.
Change Route: M25 Dartford & Heathrow
Almost immediately the motorway widens from two to four lanes - we have joined what was supposed to be a major route coming south out of London, most of which was never built, but this section gives some idea of the scale of what was planned. The other clue is that this is junction 8 when junctions 1 to 6 don't exist.