A blue sign with a diagram showing a branch off the road ahead and the following text.
Forward destinations: The SOUTH WEST; Bristol, Stroud.
Exit destinations: London; Cirencester; A417.
Junction number: 11A.
Hot on the heels of junction 11 comes 11A, serving the comparatively new cross-country expressway A417-A419 route to Swindon. It provides a shortcut to the M4, which is why London appears on the signs here.