Motorway gantry sign
A gantry spanning the motorway with blue overhead signs indicating one lane exiting and the other lane continuing ahead, and the following text.
Left lane destinations: M4 London (W); H'row [Airport symbol]; (T1, 2 & 3) .
Right lane destinations: The WEST; Slough; Reading M4 .
Change Route: M4 London or M4 The WEST
The road splits in two, and your choice is London or the boldly-announced WEST.