Star.pngStar.pngStar.pngStar grey.pngStar grey.png


From Roader's Digest: The SABRE Wiki
Jump to navigation Jump to search
Location Map ( geo)
Cameraicon.png View gallery (8)
From:  Basingstoke (SU625510)
To:  Pangbourne (SU633765)
Distance:  18.9 miles (30.4 km)
Meets:  A30, A3010, B3400, A339, B3051, A4, A329
Primary Destinations
Highway Authorities

Hampshire  • West Berkshire

Traditional Counties

Berkshire • Hampshire

Route outline (key)
A340 Ringway West, Basingstoke
(A339) Ringway North, Basingstoke
A340 Basingstoke - Aldermaston Wharf
(A4) Aldermaston Wharf - Theale
A340 Theale - Pangbourne


The A340 sits in the middle of two more important routes that lie between the M3 and the M4, namely the A33 and A339. As a consequence, it can be quite a cunning detour if there's a problem on those two roads.

Ringway West

Section 1 : Basingstoke Ringway (West)

The road starts off at the Winchester Road Roundabout, which is at the south western corner of the Basingstoke Ring Road. This first section is dual carriageway and forms the western section of the Basingstoke ring road. On this stretch there are two limited access (only south-facing sliproads) grade-separated junctions with minor roads; in between these junctions is the Thornycroft Roundabout (where it meets the A3010 and B3400). This current roundabout replaced a much larger roundabout / traffic circle (the junction was designed so that entering and circulating traffic would merge smoothly) which was a remnant of the earlier partial cloverleaf here.

At the Newbury Road Roundabout the road meets the A339, which it multiplexes with for a short distance as a D3 with a dedicated lane (westbound this lane is segregated from the main A339 flow by hatching). The route leaves the A339 (which continues as the ring road on a flyover built in 1992/3) at the signalised Aldermaston Road Roundabout. From here there is a short section of recently (2008-9) extended dual carriageway including a couple of traffic light junctions for a hospital and a new housing development before the road leaves the Basingstoke urban area.

Section 2 : Basingstoke - Theale


The road continues northwards through Sherborne St John before meeting Tadley at the Berkshire boundary. Just after this it swings sharply to the left and runs in a straight line between the boundary and the British Nuclear Fuels plant at Aldermaston, famous for not appearing on maps. It then doubles back on itself at a roundabout with the B3051 to circumnavigate the nuclear plant (built on top of its original course) and then passes through Aldermaston village.

The A340 crosses the River Kennet and the main London - Bristol railway at Aldermaston Wharf, before meeting the A4 at a roundabout. From here, it multiplexes with the A4 on a nice wide and partly dualled section (and a surprisingly long multiplex for 1922) up to Theale.

Section 3 : Theale - Pangbourne

At Theale, the A340 branches off the A4. There's then a straight run through woodland over the M4 and into the centre of Pangbourne, where it terminates on the A329.

Related Pictures
View gallery (8)
Looking back to the greyhound - Geograph - 1715890.jpgCottages in Tidmarsh - Geograph - 1715006.jpgRingway West, Worting Road Bridge - Geograph - 4159369.jpgBasingstoke ring road - Geograph - 2452983.jpgRingway North Roundabout 1973.jpg
Other nearby roads
A300 • A301 • A302 • A303 • A304 • A305 • A306 • A307 • A308 • A309 • A310 • A311 • A312 • A313 • A314 • A315 • A316 • A317 • A318 • A319
A320 • A321 • A322 • A323 • A324 • A325 • A326 • A327 • A328 • A329 • A330 • A331 • A332 • A333 • A334 • A335 • A336 • A337 • A338 • A339
A340 • A341 • A342 • A343 • A344 • A345 • A346 • A347 • A348 • A349 • A350 • A351 • A352 • A353 • A354 • A355 • A356 • A357 • A358 • A359
A360 • A361 • A362 • A363 • A364 • A365 • A366 • A367 • A368 • A369 • A370 • A371 • A372 • A373 • A374 • A375 • A376 • A377 • A378 • A379
A380 • A381 • A382 • A383 • A384 • A385 • A386 • A387 • A388 • A389 • A390 • A391 • A392 • A393 • A394 • A395 • A396 • A397 • A398 • A399
St Peters Way  Motorways: A308(M) • A329(M)  Earlier Itineraries: A303 • A326 • A331 • A333 • A341 • A346 • A355 • A364 • A369 • A374 • A378 • A392 • A397

SABRE - The Society for All British and Irish Road Enthusiasts
Discuss - Digest - Discover - Help