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M25 between J12 and Surrey boundary, Surrey (Grid ref TQ015703) M25 between J16 and Buckinghamshire boundary, Buckinghamshire (Grid ref TQ020907) M25 between Windsor and Maidenhead boundary and Windsor and Maidenhead boundary, Windsor and Maidenhead (Grid ref TQ021721) M25 between Surrey boundary and J13, Surrey (Grid ref TQ022725) M25 between Hertfordshire boundary and J17, Hertfordshire (Grid ref TQ023929) M25 between J12 and J11, Surrey (Grid ref TQ030662) M25 between J13 and J14, Surrey (Grid ref TQ030743) M25 between J17 and J18, Hertfordshire (Grid ref TQ038950) M25 between J16 and J15, Buckinghamshire (Grid ref TQ040833) M25 between J14 and Hillingdon boundary, Hillingdon (Grid ref TQ040766) M25 between J15 and Slough boundary, Slough (Grid ref TQ046782) M25 between J18 and J19, Hertfordshire (Grid ref TQ050980) M25 between J11 and J10, Surrey (Grid ref TQ056612) M25 between J19 and J20, Hertfordshire (Grid ref TL074000) M25 between J19 and A41, Hertfordshire (Grid ref TQ080993) M25 between J20 and J21, Hertfordshire (Grid ref TL100029) M25 between J21A and J21, Hertfordshire (Grid ref TL125031) M25 between J10 and J9, Surrey (Grid ref TQ132581) M25 between J21A and J22, Hertfordshire (Grid ref TL162027) M25 between J9 and J9, Surrey (Grid ref TQ170577) M25 between J23 and J22, Hertfordshire (Grid ref TL217011) M25 between J9 and J8, Surrey (Grid ref TQ221536) M25 between J23 and J24, Hertfordshire (Grid ref TL249000) M25 between J24 and Hertfordshire boundary, Hertfordshire (Grid ref TL269003) M25 between J8 and J7, Surrey (Grid ref TQ283538) M25 between J7 and J6, Surrey (Grid ref TQ335526) M25 between J25 and Enfield boundary, Enfield (Grid ref TL342000) M25 between Enfield boundary and J25, Enfield (Grid ref TL362000) M25 between J26 and Essex boundary, Essex (Grid ref TQ385999) M25 between J6 and Surrey boundary, Surrey (Grid ref TQ390541) M25 between M25 main route and A121, Essex (Grid ref TQ403998) M25 between J26 and J27, Essex (Grid ref TL443010) M25 between Kent boundary and J5, Kent (Grid ref TQ473561) M25 between Essex boundary and J27, Essex (Grid ref TQ493987) M25 between A21 and J4, Kent (Grid ref TQ496629) M25 between J5 and A421, Kent (Grid ref TQ497560) M25 between J4 and J3, Kent (Grid ref TQ503647) M25 between J5 and J4, Kent (Grid ref TQ505597) M25 between J3 and J2, Kent (Grid ref TQ540700) M25 between J28 and Havering boundary, Havering (Grid ref TQ550940) M25 between A2(T) and A282, Kent (Grid ref TQ557725) M25 between Havering boundary and J28, Havering (Grid ref TQ568923) M25 between Essex boundary and Essex boundary, Essex (Grid ref TQ571918) M25 between J29 and Havering boundary, Havering (Grid ref TQ574902) M25 between A282 and A1306, Thurrock (Grid ref TQ575782) M25 between J31 and J30, Thurrock (Grid ref TQ575793) M25 between J30 and Thurrock boundary, Thurrock (Grid ref TQ575820) M25 between Havering boundary and J29, Havering (Grid ref TQ583851)