A1, before continuing towards Stamford. Previously, the A43 stopped at a junction with the Old A1 (Great North Road) in Stamford, but now that Stamford is bypassed, the A43 continues over the River Welland, until it reaches the A1175. History of the road number The original (1923) route of the A43 was from the A42 (later the A34) at Kidlington to Stamford. After completion of the Oxford Ring Road, the southern terminus was changed to the Pear Tree Roundabout between Kidlington and Oxford. When the M40 was opened in 1991 the road from the Pear Tree Roundabout to Weston-on-the-Green was renumbered A34, and the stretch through Middleton Stoney between the A34 and junction 10 of the M40 was downgraded to the B430. External links Chris's British Roads Directory - Bad Junctions - M40/A43 SABRE Roads route description References Roads in England Transport in Lincolnshire Transport in Northamptonshire Roads in Oxfordshire