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A48 between A484 and B4310, Carmarthenshire (Grid ref SN467180) A48 between B4310 and A476, Carmarthenshire (Grid ref SN501170) A48 between A476 and M4 j49, Carmarthenshire (Grid ref SN571095) A48 between M4 j49 and A4138, Carmarthenshire (Grid ref SN586041) A48 between A4138 and A48 merge, Swansea (Grid ref SN591037) A48 between A4138 and A48 merge, Swansea (Grid ref SN591038) A48 between A48 merge and A4240, Swansea (Grid ref SN611000) A48 between A4240 and M4jn47, Swansea (Grid ref SS618991) A48 between M4 jn47 and M4 jn46, Swansea (Grid ref SS640989) A48 between M4 jn46 and A4067, Swansea (Grid ref SS657988) A48 between A4067 and A4217, Swansea (Grid ref SS680976) A48 between A4217 and M4 jn44, Swansea (Grid ref SS700976) A48 between M4 western spur and A474, Neath Port Talbot (Grid ref SS739939) A48 between A474 and B4286, Neath Port Talbot (Grid ref SS743930) A48 between B4286 and M4 J41, Neath Port Talbot (Grid ref SS750922) A48, Aberavon, Neath Port Talbot (Grid ref SS762901) A48 between M4 jn41 and A4107, Neath Port Talbot (Grid ref SS763899) A48, Margam Moors, Neath Port Talbot (Grid ref SS769891) A48 between A4107 and M4 J39, Neath Port Talbot (Grid ref SS781880) A48 between A4241 and M4 Junction 39, Neath Port Talbot (Grid ref SS791868) A48 between M4 jn39 and M4 jn38, Neath Port Talbot (Grid ref SS792867) A48 between A4241 and M4 Junction 38, Neath Port Talbot (Grid ref SS793864) A48 between M4 jn38 and Neath Port Talbot boundary, Neath Port Talbot (Grid ref SS811850) A48 between Bridgend boundary and A4229, Bridgend (Grid ref SS826822) A48 between A4229 and A4106, Bridgend (Grid ref SS857800) A48 between A4106 and A473 Laleston, Bridgend (Grid ref SS867798) A48 between A473 Laleston and B4622, Bridgend (Grid ref SS880791) A48 between B4622 and Bridgend boundary, Bridgend (Grid ref SS900785) A48 between Bridgend boundary and A473, Bridgend (Grid ref SS914785) A48 between A473 Heronston and LA boundary, Bridgend (Grid ref SS919783) A48 between LA boundary and A4222 Gibbet's Hill, The Vale of Glamorgan (Grid ref SS950764) A48 between A4222 Gibbet's Hill and A4222 Primrose Hill, The Vale of Glamorgan (Grid ref ST000747) A48 between A4222 Primrose Hill and A4226, The Vale of Glamorgan (Grid ref ST050742) A48 between A4226 and A4232 / A4050, The Vale of Glamorgan (Grid ref ST100745) A48 between A4232 / A4050 and A4161, Cardiff (Grid ref ST120750) A48 between A4161 and A4119, Cardiff (Grid ref ST150774) A48 between A4119 and A469 / A470, Cardiff (Grid ref ST160781) A48 between A469 / A470 and A4161, Cardiff (Grid ref ST200787) A48 between A4161 and A4232, Cardiff (Grid ref ST207800) A48 between A4232 and A48M jn29a, Cardiff (Grid ref ST220818) A48 between J29 and Cardiff boundary, Cardiff (Grid ref ST237822) A48 between A48M and Cardiff boundary, Cardiff (Grid ref ST240821) A48 between Newport boundary and Celtic Way, Newport (Grid ref ST250832) A48 between Newport boundary and J29A, Newport (Grid ref ST250836) A48 between Celtic Way and M4jn28 / A467, Newport (Grid ref ST283850) A48 between M4jn28 / A467 and A4042 Maes Glas, Newport (Grid ref ST290859) A48 between A4042 Maes Glas and A4042 Queen St, Newport (Grid ref ST300865) A48 between A4042 Queen St and A455, Newport (Grid ref ST320878) A48 between A4042 and A455, Newport (Grid ref ST336866) A48 between A4042 and A4810, Newport (Grid ref ST336866) A48 between A4810 and A455, Newport (Grid ref ST345870) A48 between A455 and Llanwern Rd, Newport (Grid ref ST350889) A48 between Llanwern Rd and M4 J24, Newport (Grid ref ST355893) A48 between A455 and M4 Junction 24, Newport (Grid ref ST360893) A48 between M4 jn24 and Newport boundary, Newport (Grid ref ST400911) A48 between M4 jn24 and Newport boundary, Newport (Grid ref ST400911) A48 between Monmouthshire boundary and A466, Monmouthshire (Grid ref ST498903) A48 between A466 and England, Monmouthshire (Grid ref ST530934) A48 between Gloucestershire boundary and Roundabout just north of Mead Lane, by Lydney, Gloucestershire (Grid ref SO597000) A48 between roundabout just north of Mead Lane, by Lydney and Highfield Rd, Gloucestershire (Grid ref SO646025) A48 between Highfield Road and A4151, Gloucestershire (Grid ref SO680089) A48 between A4151 and A40, Gloucestershire (Grid ref SO754154)