The A34 southbound is closed at Upper Bullington in Hampshire, with queueing traffic due to a serious accident between the A303 (Bullington Cross) and A272. On approach to the Winnall roundabout. Access is still available from the A303 to Sutton Scotney services, but no further.
The road is expected to remain closed well into the evening.
More top news
Monday afternoon's weather for the west of the region
Monday afternoon's weather for the east of the region
Top Gear favourite The Stig headed out on the road at a slower pace as a giant figure of the show's test driver headed across on a truck.