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The A420 is a road between Bristol and Oxford in England. Between Swindon and Oxford it is a primary route. ==Present route== Since the opening of the M4 motorway, the road is in two sections. The first section begins on Old Market Street near the centre of Bristol, it passes through Kingswood before leaving the city on the east side. From here it travels eastward over the southern part of the Cotswolds, to the north of Bath, to Chippenham in Wiltshire. The second section starts at a junction with the A419 east of Swindon. It then travels under the Great Western Main Line at the twin-arch Acorn Bridge and by-passes Shrivenham (the road originally went through Shrivenham, but the by-pass was built in the mid-1980s) and Watchfield, then on towards Faringdon in the Vale of White Horse. A new section by-passes Faringdon, just south of Folly Hill and crosses the A417. The A420 then travels the corallian limestone ridge that forms the north-west boundary of the Vale of White Horse, passing Littleworth, Buckland and Longworth. A dual-carriageway section by-passes Southmoor and Kingston Bagpuize on its way to Oxford. Most of the road between Swindon and Oxford, apart from the dual carriageway sections and a short section around Faringdon, is limited to 50 mph (80 km/h). A further dual-carriageway section bypasses Cumnor Hill, to give a view of the "City of Dreaming Spires" that is Oxford from the west. It then passes the Oxford Ring Road, through the suburb of Botley and down the Botley Road. It crosses the River Thames on Osney Bridge and reaches central Oxford after passing under the Cherwell Valley Line next to Oxford station. Within Oxford, it is routed along Oxpens Road, then Thames Street, parts of St Aldate's then the High Street, which is closed to most motor traffic.〔Email from Oxfordshire County Council Highways, 23 October 2007〕 The road then crosses Magdalen Bridge to St Clements and East Oxford and ascends the notoriously steep Headington Hill to the suburb of Headington before terminating at the Green Road roundabout, where it meets the A40 and the Oxford Ring Road. Large vehicles such as lorries are advised by large signs at Oxford and Swindon not to take this route and use the alternative A34 and M4 route to Swindon. This is not enforced and the road is often heavily congested due to slow HGVs taking the shorter A420 route. The road has a poor accident record and this coupled with heavy peak time traffic has caused it to be nicknamed the 'A420 Road to Hell' in the local media.〔http://www.oxfordtimes.co.uk/news/1742453.Cyclist_dies_on_A420/〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「A420 road」の詳細全文を読む スポンサード リンク
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