A-road fork sign
A green sign with a diagram showing an exit branching off the road ahead and the following text.
Forward destinations: London; A1(M) [Motorway symbol] .
Exit destinations: Peterborough; A1139 [Solid triangle diversion symbol] [Solid circle diversion symbol]; Wisbech (A47); Northampton; Oundle; A605; Non-motorway; traffic ; Services.
Junction number: 17.
74 miles after the last bit of motorway, we find another here in Cambridgeshire.