Sutton by-pass.) As the Sutton by-pass, the road passes the B279 (Sutton Common Road) and Sutton Common area, which changes name to Oldfields Road and passes the Tesco superstore in the Kimpton Park commercial and industrial area on the edge of North Cheam. It passes a crossroads with Gander Green Lane and becomes St Dunstans Hill before reaching a junction in Cheam with the A232 (High St and Ewell Road). It becomes Belmont Rise and goes past a crossroads with Northey Avenue and the road leaves the suburban area of Belmont, as well as Greater London. Bishopsford Road Bridge Details The A217 crosses the River Wandle in Mitcham on Bishopsford Road Bridge, also known as Mitcham Bridge. Flood and collapse On 10 June 2019, unusually high river waters began while the bridge was being surfaced. Jack posts had been placed underneath to support the vehicles and machinery. These trapped debris (branches, weeds etc.) for four days. The pent-up head of water surged through causing Bridge scour (eroding) up to deep and undermined the bridge footings. This led to the partial collapse of the northern arch on 14 June 2019. The southern arch was unaffected and the central arch suffered minor structural damage. Due to the collapse, the road is anticipated to reopen by the onset of Summer 2021. The Borough Council's repair work involved FM Conway and the Environment Agency. They have stabilised the bridge, pre-inspection and repair. Crack-injection and underpinning has secured the central arch. Bed scouring to the west has been filled with stone and gravel; that under the north arch, with marine concrete. Works halted for insurance investigators to inspect for evidence of liability. Banstead to Lower Kingswood At the road enters Surrey, it meets the B2230 again at a roundabout to the south of Belmont before entering the notorious 'Mad Mile' section (Brighton Road). The speed limit changes from 40 to 70 mph (113 km/h), quickly down to 60 mph and returns to 40 mph at the Banstead Crossroads junction with the A2022. For the next 5 miles, the road has an unbroken chain of average speed cameras, all of which the speed limit is 40 mph. In this area the road passes Banstead Downs, and its golf course. After passing the Banstead Crossroads, it acts as a boundary between Nork and Banstead as it heads towards Burgh Heath, passing the junctions with Garratts Lane (B2219)