- A4140 between A410 and Harrow boundary, Harrow (Grid ref TQ160934)
- A409 between A4140 and Harrow boundary, Harrow (Grid ref TQ154940)
- A4140 between A409 and A411, Hertfordshire (Grid ref TQ150940)
- A409 between Hertfordshire boundary and A411, Hertfordshire (Grid ref TQ156945)
- U, Algar Close, Harrow (Grid ref TQ159921)
- A410 between A409 and A4140, Harrow (Grid ref TQ160919)
- M1 between Harrow boundary and Harrow boundary, Harrow (Grid ref TQ169946)
- A410 between A4140 and A4140, Harrow (Grid ref TQ171923)
- A411 between A4140 and A409, Hertfordshire (Grid ref TQ150946)
- A5 between Harrow boundary and A41, Harrow (Grid ref TQ173942)
- A411 between A409 and A41(T), Hertfordshire (Grid ref TQ160950)
- A41 between A5183 / A5 and A411, Hertfordshire (Grid ref TQ164950)
- A409 between A410 and A4140, Harrow (Grid ref TQ149920)
- U, The Comyns, Hertfordshire (Grid ref TQ144943)
- C, Gordon Avenue, Harrow (Grid ref TQ161916)
- M1 between A41 and LA boundary, Barnet (Grid ref TQ175943)
- A41 between Hertfordshire boundary and A5183, Hertfordshire (Grid ref TQ175944)
- A41 between M1 spur and Barnet boundary, Barnet (Grid ref TQ176942)
- A5 between Barnet boundary and A410, Barnet (Grid ref TQ180932)
- A411 between A41(T) and A5183, Hertfordshire (Grid ref TQ170951)