A green sign with a diagram showing an exit branching off the road ahead and the following text.
Forward destinations: London; Stevenage A1 .
Exit destinations: (M11); Cambridge (A14); (M1); Bedford; A421.
Junction name: BLACK CAT.
This junction was the bane of the A1 for many years - a flat roundabout mishandling huge volumes of traffic. It's now a three-level junction with the A1 passing beneath the newly completed expressway from the M1 and Bedford to Cambridge.