Smart Motorway gantry sign
A gantry structure spanning the motorway with electronic signals, blue signs showing an exit and the following text.
Exit destinations: A505 Luton (C); Dunstable (C) .
Forward destinations: London, Luton (S) & [Airport symbol] M1.
Junction number: 11.
The M1 passes right through suburban Luton and Dunstable here, and just beyond this junction development is creeping up to the motorway. In a moment we pass through a deep concrete trench that shows how, even back in the 1950s, engineers had to thread the motorway carefully through the obstacles here.