A gantry spanning the motorway with blue overhead signs showing the following text.
Forward destinations: London, Leeds M1; Manchester (M62).
Exit destinations: A656 Castleford, A642 Garforth.
Junction number: 47.
Welcome to the M1 southbound! Our first junction, number 47, comes just moments after we leave the A1 behind.
Your author, and the illustrious creator of the Simulator, grew up just off the motorway here.