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Concept
A312 road
Summary
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 (and part of it as Hayes Bypass), is a 5-mile dual carriageway trunk road with speed limits of 30 to 50 mph, running north–south from Northolt's Target Roundabout to the A30 interchange in Hatton.
The non-primary section is mostly a single carriageway and consist of urban roads, particularly the northern part, where it serves as the main road through Northolt and South Harrow. The southern end goes through more residential areas and ends at the foot of Bushy Park. The A308 to Hampton Court Palace and Sunbury-on-Thames is a short distance to the south.
Originally, the middle section from Hatton to Hayes ran via Harlington. This road from Hatton to Harlington (then a country road) was demolished in the 1940s during the construction of Heathrow Airport - the northern half of the road in Harlington remains today as the A437, High Street. The A312 itself was rerouted from Hatton via a new road through Cranford to Hayes which opened c. 1959, again via today's A437 (North Hyde Road).
Later, a new road called The Causeway was built, cutting between the two balancing reservoirs of Heathrow's water pollution control. The A312 no longer went via the centre of Hatton (by Hatton Cross tube station) and joining the A30, instead going straight from Faggs Road via The Causeway to The Parkway.
The section of the road between Heathrow and Hayes was originally planned to be part of the Ringway 3 scheme, one of four concentric ring roads around London as part of the London Ringways project.
Official source
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