Maidenhead
High Wycombe
Smart Motorway gantry sign
A gantry structure spanning the motorway with electronic signals, blue signs showing a "tiger tail lane drop" where the left lane exits, the right hand two lanes continue ahead and the second lane from the left can go in either direction, and the following text.
Exit destinations: A308(M) [Hollow circle diversion symbol] Maidenhead; A404(M) [Solid circle diversion symbol] High Wycombe.
Forward destinations: London, Slough M4.
Junction number: 8/9.
Until the M4 made its leap westwards to Bristol, it ended here at Maidenhead. The A404(M) is a little stub of motorway that used to be the end of the M4 and got left behind.