A1178

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A1178
A1178.jpg
Cameraicon.png View gallery (3)
Ringway 3 (Part)
From: South Mimms (TL225001)
To: Potters Bar (TL263002)
Length: 2.5 miles (4 km)
Met:  A1, A1081, A1(M), A6, A111, A1005
Now part of: M25
Traditional Counties

Middlesex

Route outline (key)
A1178 South Mimms - Potters Bar
The A1178 has been upgraded and is now part of the M25

The Potters Bar southern bypass was planned as part of the M16 Ringway 3 and opened in the mid-1970s with the A1178 number. The road started on the A1 and A6 at South Mimms and headed east. A gap in the carriageway was where the mainline of Ringway 3 would have joined these slip roads, after which the road continued to end on the A111 east of Potters Bar.

In the early 1980s, with the plans for the Ringways having been considerably altered, the road was renumbered M25 and is now the section between J23 and J24. The space for the future western continuation via Borehamwood has not been used and is unlikely ever to be: the M25 to the west is an upgraded A6.



A1178
JunctionsBignells Corner • Potters Bar Interchange
PlacesPotters Bar
Related Pictures
View gallery (3)
A1178.jpgM25 westbound (C) John Reeves - Geograph - 3103000.jpg
Other nearby roads
Potters BarA1000 • A1005 • A111 • A121 • B155 (East Barnet - Potters Bar) • B156 • B157 • B158 • B556 • B650 • C114 (Hertfordshire) • C115 (Hertfordshire) • C116 (Hertfordshire) • C59 (Hertfordshire) • C60 (Hertfordshire) • E30 • Great North Road • M16 • M25 • Ringway 3
A1100-A1199
A1100 • A1101 • A1102 • A1103 • A1104 • A1105 • A1106 • A1107 • A1108 • A1109 • A1110 • A1111 • A1112 • A1113 • A1114(S) • A1114(N) • A1115 • A1116 • A1117 • A1118 • A1119
A1120 • A1121 • A1122 • A1123 • A1124 • A1125 • A1126 • A1127 • A1128 • A1129 • A1130 • A1131 • A1132 • A1133 • A1134 • A1135 • A1136 • A1137 • A1138 • A1139
A1140 • A1141 • A1142 • A1143 • A1144 • A1145 • A1146 • A1147 • A1148 • A1149 • A1150 • A1151 • A1152 • A1153 • A1154 • A1155 • A1156 • A1157 • A1158 • A1159
A1160 • A1161 • A1162 • A1163 • A1164 • A1165 • A1166 • A1167 • A1168 • A1169 • A1170 • A1171 • A1172 • A1173 • A1174 • A1175 • A1176 • A1177 • A1178 • A1179
A1180 • A1181 • A1182 • A1183 • A1184 • A1185 • A1186 • A1187 • A1188 • A1189 • A1190 • A1191 • A1192 • A1193 • A1194 • A1195 • A1196 • A1197 • A1198 • A1199(W) • A1199(E)
Previous uses: A1114 • A1120 • A1167