Southam bypass here leaves the line of the ex-A4122 which follows the unclassified road to the left
The A4122 was created when a formerly unclassified road was upgraded on 1st April, 1927, and cut the corner between the A423 and A425 south of the Warwickshire town of Southam.
Unlike many short link roads, the A4122 did not become a spur in 1935, instead retaining its number. However, today, the road is part of the A425 itself, forming part of the Southam bypass. The road has been upgraded and realigned, with the eastern end of the ex-A4122 now being the unclassified Old Road.