The Clock Interchange
|The Clock Interchange|
|Location Map ( geo)|
|The Clock roundabout with the derelict remains of the hotel behind|
|A1(M), A1000, B197, B656|
|Junctions related to the A1000|
|Junctions related to the B197|
The Clock Interchange is junction 6 of the A1(M) in Welwyn, Hertfordshire. It also marks the northern terminus of the A1000 and intersects with the B197 (former A1 Great North Road). It takes its name from the now defunct Clock Hotel situated at the northern extremity of the junction.
Historically, the B1000 Hertford Road ran east-west through the site to its junction with London Road in Welwyn. When the Welwyn Bypass was built, the A1 bridged over the B1000 on the bridge presently carrying the B197. There were no links between the A1 and B197 at this time.
Eventually the two were joined by a pair of link roads to the north-west and north-east of the bridge, forming one of the earliest grade separated junctions. Further north, the Welwyn bypass joined the original Great North Road by the Clock Hotel.
In the early 1960s, one of the first stretches of A1(M) was built from the Clock towards Stevenage. This was a roundabout junction.
In the early 1970s the A1(M) Welwyn Garden City bypass was built and the interchange took the form we see today except the B1000 was renumbered to A1000. During the construction of this section of motorway, a Roman bath house was discovered along the line of the new motorway. The bath house was enclosed in a corrugated steel culvert and is regularly open to the public.
|The North, Stevenage|
|Welwyn Gdn City, Hertford|