Slough (C)
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: A355 [Hollow circle diversion symbol] Slough (C); (A332) Windsor.
Forward destinations: London M4.
Junction number: 6.
From this junction a fast dual carriageway will zip you south to the middle of Windsor, or a slower dual carriageway will allow you to muddle your way in to the middle of Slough.