Motorway cantilever sign
A blue overhead sign suspended over the motorway from a post on the left, with a diagonal arrow pointing up and left, and the following text.
A4 Slough (W).
Junction number: 7.
Off at this exit is the Huntercombe Spur, a little motorway link road to the Slough suburbs. Beyond it we find ourselves on the Maidenhead Bypass, the oldest part of the M4 - it opened in 1961, but construction first started in the 1930s.