A340 road

A340
Route information
Length	17 mi (27 km)
Major junctions
South end	Basingstoke 51.2555°N 1.1040°W / 51.2555; -1.1040 (A340 road (southern end))
Major intersections	A339 A33 A4 A329
North end	Pangbourne 51.4837°N 1.0875°W / 51.4837; -1.0875 (A340 road (northern end))
Location
Country	United Kingdom
Road network
Roads in the United Kingdom Motorways A and B road zones

The A340 is a major road in the south of England, portions of which are known as the Aldermaston Road, Tadley Hill, Basingstoke Road and Tidmarsh Road.

Route

Starting in the south of Basingstoke, Hampshire, it runs west, forming the western side of the Basingstoke ringroad, before swinging north to Tadley and then enters Berkshire. It passes the gates of the Atomic Weapons Establishment at Aldermaston, before passing through the village of Aldermaston itself and then joining the A4 at Aldermaston Wharf. After approximately 2.5 miles (4.0 km) north-east, the A340 runs further north to Pangbourne, to the west of Reading. This section of the road is thought to follow the Roman road from Calleva Atrebatum (about 7 miles (11 km) to the south).

See also

• Great Britain road numbering scheme