A-road roundabout sign
A green sign with a diagram showing a roundabout with exits ahead, left and right, and the following text.
Forward destinations: London; Stevenage A1 [Solid circle diversion symbol] [Solid square diversion symbol] .
Left turn destinations: Buckden.
Right turn destinations: Kimbolton; B661 (B645).
Buckden is also home to this roundabout, which may come as a surprise since it's the first one the A1 has encountered in 275 miles.