The A303 has been closed from M3 Junction 8 junction to A34 Bullington Cross junction.
The incident is expected to be protracted and in place for several hours.
Following are the diversion routes:
Road users travelling westbound are advised to follow the hollow square diversion symbol on road signs:
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Travel M3 westbound towards Winchester
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Exit the M3 at Junction 9 and take the fourth exit on to the A34 northbound
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Travel on the A34 and rejoin the A303 westbound at Bullington Cross Interchange
Road users travelling eastbound are advised to follow the hollow circle diversion symbol on road signs:
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Exit the Bullington Cross Interchange on to the A34 southbound towards Winchester
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At the roundabout with the M3, take the first exit on to the M3 eastbound
Non Motorway traffic
If this closure impacts on your planned route, please allow extra journey time. Plan ahead, you may wish to re-route or even delay your journey.
Further information is available from National Highways by visiting www.trafficengland.com and travel apps, or via regional X feed.
National Highways’ 24/7 contact centre team is also available to provide up to the minute information on 0300 123 5000.