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M4 between J49 and J48, Carmarthenshire (Grid ref SN573067) M4 between J48 and Carmarthenshire boundary, Carmarthenshire (Grid ref SN580029) M4 between Swansea boundary and J47, Swansea (Grid ref SN592025) M4 between J47 and J46, Swansea (Grid ref SS631992) M4 between J46 and J45, Swansea (Grid ref SS653993) M4 between J45 and J44, Swansea (Grid ref SS689990) M4 between J44 and Swansea boundary, Swansea (Grid ref SS705973) M4 between Neath Port Talbot boundary and J43, Neath Port Talbot (Grid ref SS720967) M4 between J43 and J42 western spur, Neath Port Talbot (Grid ref SS724955) M4 between J42 western spur and J42 eastern spur, Neath Port Talbot (Grid ref SS727950) M4 between A483 and M4 (42) main carriageway, Neath Port Talbot (Grid ref SS729940) M4 between M4 (42) main carriageway and A48/A483, Neath Port Talbot (Grid ref SS729945) M4 between J42 eastern spur and J41 mid-junction, Neath Port Talbot (Grid ref SS746923) M4 between J41 main carriageway mid-junction and A4241/A48, Neath Port Talbot (Grid ref SS749922) M4 between J41 mid-junction and J40, Neath Port Talbot (Grid ref SS769902) M4 between J40 and J39, Neath Port Talbot (Grid ref SS784880) M4 between M4 Junction 40 and M4 Junction 39, Neath Port Talbot (Grid ref SS784880) M4 between Roundabout and M4 Junction 39, Neath Port Talbot (Grid ref SS789871) M4 between J39 and J38, Neath Port Talbot (Grid ref SS792867) M4 between M4 Junction 39 and M4 Junction 38, Neath Port Talbot (Grid ref SS792867) M4 between J38 and Neath Port Talbot boundary, Neath Port Talbot (Grid ref SS800844) M4 between Bridgend boundary and J37, Bridgend (Grid ref SS807821) M4 between J37 and J36, Bridgend (Grid ref SS900828) M4 between J36 and J35, Bridgend (Grid ref SS942819) M4 between J35 and Rhondda, Cynon, Taff boundary, Rhondda, Cynon, Taff (Grid ref ST028805) M4 between The Vale of Glamorgan boundary and J34, The Vale of Glamorgan (Grid ref ST057799) M4 between J34 and J33, The Vale of Glamorgan (Grid ref ST071796) M4 between J33 and J32, Cardiff (Grid ref ST100799) M4 between J32 and J30, Cardiff (Grid ref ST200836) M4 between J30 and Cardiff boundary, Cardiff (Grid ref ST225830) M4 between Newport boundary and J29, Newport (Grid ref ST240838) M4 between J29 and J28, Newport (Grid ref ST267843) M4 between J28 and J27, Newport (Grid ref ST285870) M4 between J27 and J26, Newport (Grid ref ST300893) M4 between J26 and J25A, Newport (Grid ref ST309898) M4 between J25a and J25, Newport (Grid ref ST320899) M4 between J25 and J24, Newport (Grid ref ST350893) M4 between J24 and Newport boundary, Newport (Grid ref ST391892) M4 between Monmouthshire boundary and J23A, Monmouthshire (Grid ref ST417880) M4 between J23A and J23, Monmouthshire (Grid ref ST431878) M4 between J23 and Monmouthshire boundary, Monmouthshire (Grid ref ST480872) M4 between South Gloucestershire boundary and J22, South Gloucestershire (Grid ref ST526860) M4 between J22 and J21, South Gloucestershire (Grid ref ST580865) M4 between J21 and J20 / M5, South Gloucestershire (Grid ref ST610850) M4 between M5 (20) and J19, South Gloucestershire (Grid ref ST631815) M4 between J19 and J18, South Gloucestershire (Grid ref ST700777) M4 between J18 and South Gloucestershire boundary, South Gloucestershire (Grid ref ST780785) M4 between Wiltshire boundary and J17, Wiltshire (Grid ref ST892790) M4 between J17 and J16, Wiltshire (Grid ref SU015826) M4 between J16 and Wiltshire boundary, Wiltshire (Grid ref SU107827) M4 between Swindon boundary and J15, Swindon (Grid ref SU155819) M4 between J15 and Swindon boundary, Swindon (Grid ref SU220809) M4 between Wiltshire boundary and Wiltshire boundary, Wiltshire (Grid ref SU258794) M4 between West Berkshire boundary and J14, West Berkshire (Grid ref SU324750) M4 between J14 and J13, West Berkshire (Grid ref SU416726) M4 between J13 and J12, West Berkshire (Grid ref SU493733) M4 between J12 and West Berkshire boundary, West Berkshire (Grid ref SU680696) M4 between Wokingham boundary and Wokingham boundary, Wokingham (Grid ref SU705692) M4 between Reading boundary and J11, Reading (Grid ref SU713687) M4 between J11 and Reading boundary, Reading (Grid ref SU718686) M4 between Wokingham boundary and J10, Wokingham (Grid ref SU750696) M4 between J10 and Wokingham boundary, Wokingham (Grid ref SU810717) M4 between Windsor and Maidenhead boundary and Windsor and Maidenhead boundary, Windsor and Maidenhead (Grid ref SU833735) M4 between Bracknell Forest boundary and Bracknell Forest boundary, Bracknell Forest (Grid ref SU849747) M4 between Windsor and Maidenhead boundary and J08-Sep, Windsor and Maidenhead (Grid ref SU860764) M4 between J08-Sep and Windsor and Maidenhead boundary, Windsor and Maidenhead (Grid ref SU896786) M4 between Buckinghamshire boundary and J7, Buckinghamshire (Grid ref SU923799) M4 between J7 and Buckinghamshire boundary, Buckinghamshire (Grid ref SU934800) M4 between Slough boundary and A4, Slough (Grid ref SU934809) M4 between J7 and Buckinghamshire boundary, Buckinghamshire (Grid ref SU934805) M4 between Slough boundary and J6, Slough (Grid ref SU947796) M4 between J6 and Slough boundary, Slough (Grid ref SU970790) M4 between Windsor and Maidenhead boundary and Windsor and Maidenhead boundary, Windsor and Maidenhead (Grid ref SU985780) M4 between Slough boundary and J5, Slough (Grid ref TQ010779) M4 between J5 and J4B / M25, Slough (Grid ref TQ030781) M4 between J4B / M25 and Slough boundary, Slough (Grid ref TQ047783) M4 between Hillingdon boundary and J4, Hillingdon (Grid ref TQ060784) M4 between J4 and A4, Hillingdon (Grid ref TQ074778) M4 between J4 and A408, Hillingdon (Grid ref TQ074786) M4 between J4 and J3, Hillingdon (Grid ref TQ089784) M4 between Hounslow boundary and A312, Hounslow (Grid ref TQ104782) M4 between J3 and J2, Hounslow (Grid ref TQ147786) M4 between J2 and J1, Hounslow (Grid ref TQ186783)