Tourist exit sign
A brown sign with an arrow pointing diagonally up and left, and the following text.
Windsor; Castle [Castle symbol] Legoland [Fairground or theme park symbol] Ascot; Racecourse [Racecourse symbol] .
Also signposted for the next junction is the Slough Trading Estate, made famous by the sitcom The Office, making it a sort of weird niche tourist attraction in its own right.