The A312 is an A road in England, running across west London from Hampton to Harrow. Its status varies from a local urban street to a major dual carriageway in Hayes. Part the road has been diverted to make way for Heathrow Airport, while another stretch was originally planned to be Ringway 3, one of four major ring motorways around London.
The road is part primary, part non-primary, which reflects its status as a mix of local and regionally important traffic. The primary section of the road, under the name The Parkway , is a 5-mile dual carriageway trunk road with speed limits of 40 to 50 mph, running north–south from Northolt's Target Roundabout to the A30 interchange in Hatton.
Source: Wikipedia.org
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