- A406 between A4020 and A40, Ealing (Grid ref TQ186816)
- A406 between A4000 and A4020, Ealing (Grid ref TQ187800)
- A406 between A40 and Ealing boundary, Ealing (Grid ref TQ189832)
- A406 between A4/A205 and A4000, Hounslow (Grid ref TQ193790)
- A406 between Brent boundary and A404, Brent (Grid ref TQ196839)
- A406 between A404 and A4088, Brent (Grid ref TQ202845)
- A406 between A4088 (midpoint) and A4088 Neasden Lane North, Brent (Grid ref TQ211860)
- A406 between A4088/A406 cross (near vicarage way) and A406 meets Waterloo Road, Brent (Grid ref TQ216867)
- A406 between A4088 Neasden Lane North and A5, Brent (Grid ref TQ220870)
- A406 between A406 meets Waterloo Road and Roundabout where A5 Edware Road meetings A406 North Circular Road, Brent (Grid ref TQ224871)
- A406 between A406 meets Waterloo Road and On A406 close to tilling road roundabout (parallel to Etheridge Road), Brent (Grid ref TQ224872)
- A406 between A5 and M1 roundabout, Barnet (Grid ref TQ227873)
- A406 between A5 and M1 roundabout, Barnet (Grid ref TQ227873)
- A406 between Roundabout where M1 meets A406 and On A406 close to tilling road roundabout (parallel to Etheridge Road), Barnet (Grid ref TQ230875)
- A406 between On A406 close to tilling road roundabout (parallel to Etheridge Road) and A406 north circular road meets A41 Brent Cross Flyover, Barnet (Grid ref TQ233877)
- A406 between M1 roundabout and A41, Barnet (Grid ref TQ233877)
- A406 between A41 and A502, Barnet (Grid ref TQ237881)
- A406 between A502 and A1, Barnet (Grid ref TQ241890)
- A406 between A1 and A504, Barnet (Grid ref TQ254895)
- A406 between A504 and A406 spur, Barnet (Grid ref TQ258900)
- A406 between A406 main route and A1000, Barnet (Grid ref TQ265905)
- A406 between A406 spur and A406 spur, Barnet (Grid ref TQ265907)
- A406 between A406 main route and A1000, Barnet (Grid ref TQ266908)
- A406 between A406 spur and Barnet boundary, Barnet (Grid ref TQ275912)
- A406 between LA boundary and A109, Enfield (Grid ref TQ290918)
- A406 between A109 and A1110, Enfield (Grid ref TQ294921)
- A406 between A1110 and A105, Enfield (Grid ref TQ300922)
- A406 between A105 and A10(T), Enfield (Grid ref TQ318925)
- A406 between A10(T) and A1010, Enfield (Grid ref TQ329924)
- A406 between A1010 and A1055, Enfield (Grid ref TQ344923)
- A406 between A1055 and Enfield boundary, Enfield (Grid ref TQ355921)
- A406 between Waltham Forest boundary and A1009, Waltham Forest (Grid ref TQ362922)
- A406 between A1009 and A112, Waltham Forest (Grid ref TQ368915)
- A406 between A112 and A104, Waltham Forest (Grid ref TQ390906)
- A406 between A104 and Waltham Forest boundary, Waltham Forest (Grid ref TQ394904)
- A406 between Redbridge boundary and Southend Road (North Cicular Road), Redbridge (Grid ref TQ400904)
- A406 between M11 and M11, Redbridge (Grid ref TQ410903)
- A406 between M11 western end-spur and M11 eastern end-spur (mid-junction), Redbridge (Grid ref TQ412900)
- A406 between Centre point M11 Slip roads and A12 redbridge r/abt, Redbridge (Grid ref TQ414889)
- A406 between A12 and A118, Redbridge (Grid ref TQ420879)
- A406 between A118 and Redbridge boundary, Redbridge (Grid ref TQ434860)
- A406 between Newham boundary and A124, Newham (Grid ref TQ434856)
- A406 between A124 and A13, Newham (Grid ref TQ437835)