Motorway gantry sign
A gantry spanning the motorway with blue overhead signs showing the following text.
Forward destinations: London A1(M) .
Exit destinations: A414 Hertford, A1001 Hatfield; A6129 Welwyn Garden City.
Junction number: 4.
Junction 5 only exists as an entrance sliproad northbound, so didn't even make a ripple as we zoomed past it to reach number 4. We've now reached Hatfield, the last place of any significance before the M25.