|Length:||22.4 mi (36.0 km)|
| A361 road
|North end:||Near Coventry|
The A423 road is a primary A road in England which leads from central Banbury to the A45 near Coventry. It starts in Banbury town centre as Southam Road and goes through the Southam Road Industrial Estate, then just north of Banbury it crosses over the M40, from there it passes close to several Warwickshire villages until it becomes part of the Southam by-pass, it then goes through Long Itchington and Marton before merging with the A45 near Ryton.
Its original route when first classified in 1922 was from Tamworth in Staffordshire to Oxford. In the 1930s the route was extended from Oxford to the A4 near Maidenhead in Berkshire, over parts of the former routes of the A42 and A415. From 1971 to 1990 it joined the then A423(M) motorway at Maidenhead Thicket. A curious feature of the route was a 3-mile (4.8 km) gap between Benson, Oxfordshire and a point 1.2 miles (1.9 km) north west of Nuffield, which resulted from the construction of RAF Benson across the line of the road. The detour though Crowmarsh Gifford was designated the B479 and A4130 rather than A423.
On the completion of the M42 motorway in the early 1980s, the phase of the A423 between Tamworth and Coventry was downgraded to become a B-road.
The final downgrading came in 1990 when the M40 motorway between Oxford and Birmingham was completed. The remainder of the route south of Banbury was renumbered to become parts of the A4260, A4074 and A4130, although it is briefly reprised as part of the Oxford Ring Road between the A34 Hinksey Hill interchange and the A4142/A4074 Heyford Hill roundabout. This is because the A4074 used to be the A423 prior to the M40 motorway being built. On this stretch of road, heading eastbound, drivers will notice the "distance" sign showing the name A423 and the destinations that the former A423 route would have passed through. This can be seen on the following Google StreetView image - here
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