Surface water is gathering on this short section of the A303 and creating a real risk of aquaplaning for motorists.
For the safety of all road users, single lane closures are in place eastbound and westbound, with 50mph speed restrictions, and investigations and surveys are currently being completed.
Once the findings of the surveys are known, Highways England will work with contractors Skanska on a scheme of work to rectify the flooding problem.
The single lane closures will remain in the meantime, as a safety measure.
For all motorists intending to use the A303 over the Spring Bank Holiday weekend, the advice is to plan all journeys and check for up-to-date travel information.
A Highways England spokesman said:
Safety is our top priority and we have implemented the lane closures while we investigate what work needs to be carried out.
We are working together with our contractors as a matter of urgency, with the aim of finishing the work in time for the summer school holidays.
Highways England provides live traffic information via its website or from a phone or mobile device.
Travel information is also available by phone from the Highways England Customer Contact Centre on 0300 123 5000 and updates will be provided via Twitter.
Members of the public should contact the Highways England customer contact centre on 0300 123 5000.
Journalists should contact the Highways England press office on 0844 693 1448 and use the menu to speak to the most appropriate press officer.