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: A329(M) [Hollow square diversion symbol] ; Reading (E); Bracknell, Wokingham.
Forward destinations: SOUTH WALES; Bristol, Reading (S, W & C) M4 .
Junction number: 10.
A huge free-flowing interchange connects the M4 to this little motorway between Berkshire towns.