- A12 between A106 and A106, Hackney (Grid ref TQ366850)
- A12 between A106 and Hackney boundary, Hackney (Grid ref TQ368845)
- A12 between Tower Hamlets boundary and B142, Tower Hamlets (Grid ref TQ370840)
- A12 between B142 and B142, Tower Hamlets (Grid ref TQ373834)
- A12 between A106 and Hackney boundary, Hackney (Grid ref TQ374854)
- A12 between A11 and B142, Tower Hamlets (Grid ref TQ375832)
- A12 between A13 and A11, Tower Hamlets (Grid ref TQ381818)
- A12 between Waltham Forest boundary and A114 / A11, Waltham Forest (Grid ref TQ384862)
- A12 between A114 and Waltham Forest boundary, Waltham Forest (Grid ref TQ399878)
- A12 between Redbridge boundary and A1008, Redbridge (Grid ref TQ402880)
- A12 between A1008 and A406, Redbridge (Grid ref TQ411884)
- A12 between A406 and A123/A1400, Redbridge (Grid ref TQ430884)
- A12 between A1400/A123 Rndbt - Cranbrook Road and LA boundary, Redbridge (Grid ref TQ450883)
- A12 between LA boundary and A1112, Barking and Dagenham (Grid ref TQ481890)
- A12 between A1112 and LA boundary, Barking and Dagenham (Grid ref TQ486890)
- A12 between Havering boundary and A125, Havering (Grid ref TQ500891)
- A12 between A125 and A118/A127, Havering (Grid ref TQ508900)
- A12 between A118/A127 and MAYLANDS WAY, Havering (Grid ref TQ550914)
- A12 between M25 and A1023, Essex (Grid ref TQ586948)
- A12 between A1023 and A1016, Essex (Grid ref TL669021)
- A12 between A1016 and A4114 / A130, Essex (Grid ref TL700017)
- A12 between A414 and A138, Essex (Grid ref TL741074)
- A12 between A4114 / A130 and A1060/A414, Essex (Grid ref TL748050)
- A12 between A138 and B1389, Essex (Grid ref TL778113)
- A12 between B1389N and B1389S, Essex (Grid ref TL829150)
- A12 between B1389S and B1024N, Essex (Grid ref TL840166)
- A12 between B1024 and B1024S, Essex (Grid ref TL862177)
- A12 between B1024S and A120, Essex (Grid ref TL889212)
- A12 between A120 and A604 / A133, Essex (Grid ref TL930244)
- A12 between A604 / A133 and A12 sidelink, Essex (Grid ref TL955252)
- A12 between A12 main route and A133, Essex (Grid ref TL970256)
- A12 between A12 sidelink and A120, Essex (Grid ref TL975277)
- A12 between A12 sidelink and A120, Essex (Grid ref TM003292)
- A12 between A12 sidelink and A120, Essex (Grid ref TM006292)
- A12 between A120 and A1232, Essex (Grid ref TM015291)
- A12 between A1232 and Essex boundary, Essex (Grid ref TM030309)
- A12 between Suffolk boundary and B1068, Suffolk (Grid ref TM050345)
- A12 between B1068 and B1070, Suffolk (Grid ref TM062360)
- A12 between B1070 and A14, Suffolk (Grid ref TM101385)
- A12 between Eagle Way roundabout and A1214 Main Road, Suffolk (Grid ref TM244460)
- A12 between A14/A1156 and Eagle Way roundabout, Ipswich, Suffolk (Grid ref TM247450)
- A12 between A14/A1156 and Eagle Way roundabout, Ipswich, Suffolk (Grid ref TM247450)
- A12 between A1214 and A1152, Suffolk (Grid ref TM266503)
- A12 between A1152 Woods Lane and B1078 Lower Hacheston, Suffolk (Grid ref TM302540)
- A12 between B1078 and A1094, Suffolk (Grid ref TM357600)
- A12 between A1094 and A1120, Suffolk (Grid ref TM377650)
- A12 between A1120 High Street Yoxford and A144, Suffolk (Grid ref TM400691)
- A12 between A144 and B1125 Angel Lane, Suffolk (Grid ref TM435737)
- A12 between B1125 Angel Lane and A145, Suffolk (Grid ref TM452757)
- A12 between A145 and A1095, Suffolk (Grid ref TM452762)
- A12 between A1095 and Tower Rd roundabout, Suffolk (Grid ref TM475800)
- A12 between A1243 and A47, Norfolk (Grid ref TG514075)
- A12 between A1243 and A143, Norfolk (Grid ref TG520054)
- A12 between Norfolk boundary and Links Rd, Norfolk (Grid ref TG521015)
- A12 between Links Rd roundabout and A143, Norfolk (Grid ref TG523035)
- A12 between B1385 Corton Long Lane and Suffolk boundary, Suffolk (Grid ref TM528980)
- A12 between Tower Rd roundabout and A1117, Suffolk (Grid ref TM532895)
- A12 between A1117 and London Road South, Suffolk (Grid ref TM533914)
- A12 between A1117 Bloodmoor Road and A1145 Stradbroke Road, Suffolk (Grid ref TM533900)
- A12 between A1117 and B1385 Corton Long Lane, Suffolk (Grid ref TM534962)
- A12 between A1145 Stradbroke Road and A1118 Kensington Road, Suffolk (Grid ref TM537908)
- A12 between A1118 Kensington Road Jct and A146 Pier Terrace/Belvedere Road, Suffolk (Grid ref TM543920)
- A12 between A12 Kensington Road and A12 Pier Terrace, Suffolk (Grid ref TM544920)
- A12 between Waveney Road and A1144 St Peter's Street, Suffolk (Grid ref TM546930)
- A12 between Waveney Road and A1144 St Peter's Street, Suffolk (Grid ref TM546930)
- A12 between Waveney Road and St Peter's Street Rndbt, Suffolk (Grid ref TM546930)
- A12 between Pier Terrace/A146 Belvedere Road and Waveney Road, Suffolk (Grid ref TM547927)
- A12 between Pier Terrace/A146 Belvedere Road and Waveney Road, Suffolk (Grid ref TM547927)
- A12 between A1144 St Peter's Street and Jubilee Way Rndbt, Suffolk (Grid ref TM549937)
- A12 between A1144 St Peter's Street and Jubilee Way Rndbt, Suffolk (Grid ref TM549937)
- A12 between A12 split and A1117, Suffolk (Grid ref TM550943)
- A12 between Waveney Road and St Peter's Street Rndbt, Suffolk (Grid ref TM550930)
- A12 between Waveney Road and A1144 St Peter's Street, Suffolk (Grid ref TM550930)