The road begins at the A4 junction just outside of the small village Pewsham, to the east of Chippenham. It heads south past the village of Derry Hill towards Devizes, briefly meeting with the A3102 near Sandy Lane. Just outside Devizes the road meets the A361 and once in the centre of town meets the A360. Continuing south east the road crosses Salisbury Plain before reaching Upavon where the road meets the A345 and heads east. After heading through Everleigh the road meets the A338 before entering Ludgershall and meeting the A3026. The final part of the route heads south east where it ends at a roundabout with the A343 and A303 just outside Andover.
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