Location : The M25 clockwise at junction J31 .

Location : The M25 clockwise entry slip at junction J31 .

Location : The A1 northbound between the junctions with the A141 and the A1M .

Location : The A14 eastbound between junctions J21 and J24B .

Location : The M40 southbound at junction J9 .

Location : The M40 southbound entry slip at junction J9 .

Location : The A34 southbound entry slip from the A423 north of Kennington.

Location : The M40 northbound between junctions J8A and J9 .

Location : The A308M eastbound between the junctions with the M4 and the A308 .

Location : The M4 westbound between junctions J13 and J14 .

Location : The M4 westbound entry slip at junction J6 .

Location : The M4 westbound between junctions J6 and J7 .