A4 road
| A4 road in the UK | |
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| Basic data | |
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| Start of the street: | London |
| End of street: | Avonmouth |
| Overall length: | 203.8 km (126.6 mi ) |
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| A4 at London Heathrow Airport (photo 2008) | |
Also known as the Bath road known A4 road ( English for road A4 ) is a partial route as the primary designated trunk road in England which largely parallel to the M4 motorway runs. With the commissioning of the M4, it has largely lost its national importance. It starts in London at Holborn Circus, runs in a general westerly direction via Hammersmith and Harmondsworth , where it crosses the M25 motorway ring around London (the next junction is junction 14), and crosses the M4 at junction 5, where it is primary Route loses, goes through Slough , crosses the short A404 (M) road west of Maidenhead , goes through Reading and crosses the M4 again at junction 12. In its further course it leads through Newbury , Hungerford and Marlborough to Chippenham . West of this city it becomes the Primary route again and leads to Bath and from there to Bristol and from there to Avonmouth on the Severn Estuary where it ends.