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Location Map ( geo)
Cameraicon.png View gallery (30)
From:  East Finchley, London (TQ276886)
To:  Welwyn Garden City (TL235165)
Distance:  21 miles (33.8 km)
Meets:  A1, A504, A406, A598, A1003, A109, A5109, A110, A411, A1081, A111, A1001, A414, A5129, A1(M)
Former Number(s):  A1
Primary Destinations
Highway Authorities

Barnet • Haringey • Hertfordshire

Traditional Counties

Hertfordshire • Middlesex

Route outline (key)
A1000 East Finchley - Welwyn Garden City
This article is about the current use of the number.
For the former A1000 that ran Finsbury Park Station - Muswell Hill, see A1000 (Finsbury Park Station - Muswell Hill)

The greater part of the A1000 follows the former route of the A1 from East Finchley to Hatfield, as evidenced by many sections of it which are known as Great North Road.

Starting on the A1 north of Highgate the road heads north through East Finchley, after which there is a Grade Separated Junction (GSJ) with the A406 North Circular. In North Finchley the road meets the A1003 and is forced left onto a gyratory, with northbound traffic using part of the A598 to return to the A1000 (southbound traffic follows the direct route). The road then continues through Whetstone, where it is briefly dualled, before reaching Barnet. After going under the Northern line the A1081 St Albans Road turns off left at traffic lights. Although both roads here have 4-digit numbers and seem quite unimportant this was once a major road junction as it was where the A6 turned off the A1.

The road continues north through open country, passing under the M25 to enter Potters Bar where it turns right at a signal controlled junction into Potters Bar High Street. The straight-ahead movement at this junction is the start of the present B556. The road continues north, passing the Brookmans Park Transmitters before reaching a fork grade-separated junction on the southern edge of Hatfield. Ahead is the A1001 southern bypass whilst the A1000 has to TOTSO. Unusually for a grade-separated junction, both roads are S2. The road now runs to the east of Hatfield, parallel to the East Coast Main Line, before running through Old Hatfield to reach a set of traffic lights.

A1000 Hertford Road, Hatfield

The route of the A1000 north of here has never been part of the Great North Road or the A1, and was built as the new town developed. The Great North Road from this point followed a straighter route past the west of the town and up to Welwyn along the B197, shown in this Google Maps extract. When originally inaugurated the A1000 continued ahead and soon met the A1 once more. However, it is no longer possible to follow this route; this is not just due to urban development, more that the railway bridge (Wrestlers Bridge) collapsed in 1966 and was only rebuilt as a footbridge. The A1000 therefore TOTSOs right at the traffic lights to cross the A414 at a GSJ to reach the next town, Welwyn Garden City.

A wide S2 road liberally scattered with roundabouts takes the A1000 to the east of the town centre before reaching the Mundells gyratory, which includes a junction with the present alignment of the B1000. The A1000 then continues north-west under the Welwyn Viaduct (sometimes known as the Digswell Viaduct) and over the River Mimram to become D2. The road heads west for a short distance to reach A1(M) J6 where it also meets the Great North Road (now B197) once more. The south-facing and north-facing slip roads are a short distance apart so the A1000 follows the former A1 for a short distance to connect the whole of the junction.


The section through Welwyn Garden City is much newer than the rest of the route and was a mix of new build in the late 1950s / early 1960s and some earlier roads in the town. By 1963, most of the route was built, with the exception of the grade-separated junction with the A414 at Mill Green, though it was classified as a series of B roads including B556 and B190. The route was reclassified as A1000 between 1970 and 1971 and included an upgraded section of the former B1000 to link through to the A1(M) at J6.

Related Pictures
View gallery (30)
A1000 Hertford Road in Hatfield - Geograph - 1318160.jpgA1000 Old GSJ - 3 - Coppermine - 5004.jpgA1000 Old GSJ - 5 - Coppermine - 5006.jpgA1000 Old GSJ - 9 - Coppermine - 5010.jpgA1000 approach to A1(M) junction 6 - Coppermine - 4980.jpg
Other nearby roads
Potters Bar
Welwyn Garden City
A1000 • A1001 • A1002 • A1003 • A1004 • A1005 • A1006 • A1007 • A1008 • A1009 • A1010 • A1011 • A1012 • A1013 • A1014 • A1015 • A1016 • A1017 • A1018 • A1019
A1020 • A1021 • A1022 • A1023 • A1024 • A1025 • A1026 • A1027 • A1028 • A1029 • A1030 • A1031 • A1032 • A1033 • A1034 • A1035 • A1036 • A1037 • A1038 • A1039
A1040 • A1041 • A1042 (N) • A1042 (S) • A1043 • A1044 • A1045 • A1046 • A1047 • A1048 • A1049 • A1050 • A1051 • A1052 • A1053 • A1054 • A1055 • A1056 (N) • A1056 (S) • A1057 • A1058 • A1058(M) • A1059
A1060 • A1061 • A1062 • A1063 • A1064 • A1065 • A1066 • A1067 • A1068 • A1069 • A1070 • A1071 • A1072 • A1073 • A1074 • A1075 • A1076 • A1077 • A1078 • A1079
A1080 • A1081 • A1082 • A1083 • A1084 • A1085 • A1086 • A1087 • A1088 • A1089 • A1090 • A1091 • A1092 • A1093 • A1094 • A1095 • A1096 • A1097 • A1098 • A1099
Earlier Uses: A1000 • A1001 • A1010 • A1016(N) • A1016(S) • A1018(S) • A1018(N) • A1019 • A1020 • A1021 • A1022 • A1023 • A1025 • A1027 • A1032(N) • A1032 (S) • A1037
A1041(N) • A1041(S) • A1053 • A1054 • A1055 • A1056 • A1057 • A1059 • A1060 • A1062 • A1063 • A1070(E) • A1070(W) • A1072 • A1074(E) • A1074(W) • A1075 • A1076 • A1078
A1080 • A1081 • A1082 • A1089 • A1090 • A1096

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