- A312 between Hillingdon boundary and A437, Hillingdon (Grid ref TQ100789)
- A312 between A315 and A30/A312/A4, Hounslow (Grid ref TQ102749)
- A312 between A4 and M4 J3, Hounslow (Grid ref TQ104780)
- A312 between Hounslow boundary and A312, Hounslow (Grid ref TQ104788)
- A312 between M4 and A312 North Hyde Rd, Hounslow (Grid ref TQ104785)
- A312 between A132 and Hounslow boundary, Hounslow (Grid ref TQ105790)
- A312 between A244 and A315, Hounslow (Grid ref TQ107740)
- A312 between Hillingdon boundary and A4020 Uxbridge rd, Hillingdon (Grid ref TQ107800)
- A312 between A30 and A4(T), Hounslow (Grid ref TQ108764)
- A312 between A4020 and Hillingdon boundary, Hillingdon (Grid ref TQ112813)
- A312 between Ealing boundary and A4180, Ealing (Grid ref TQ118826)
- A312 between A314 and A244, Hounslow (Grid ref TQ120726)
- A312 between A4180 and A40, Ealing (Grid ref TQ120834)
- A312 between A316 and A314, Hounslow (Grid ref TQ124722)
- A312 between Hounslow boundary and A316, Hounslow (Grid ref TQ129720)
- A312 between A313 and Richmond upon Thames boundary, Richmond upon Thames (Grid ref TQ133718)
- A312 between A4090 and A4090, Ealing (Grid ref TQ137853)
- A312 between A40(T) and A4090, Ealing (Grid ref TQ137850)
- A312 between A311 and A313, Richmond upon Thames (Grid ref TQ138710)
- A312 between A4090 and A4005, Harrow (Grid ref TQ140860)
- A312 between A4005 and A404, Harrow (Grid ref TQ147870)