The work will be taking place on the A33 between the B3047 near Kings Worthy and the A34 and will involve full overnight closures of the road.
Guy Watts, Highways Agency Project Sponsor said:
The work on the A33 between the B3047 near Kings Worthy and the A34 will involve the clearance of nearby vegetation and the installation of new filter drains which will reduce the likelihood of flooding and improve safety during heavy rainfall.
We have planned the work carefully to minimise disruption and that is why we will only be closing the road overnight when traffic flows are at their lowest. During the closures, there will be a clearly signed diversion route so that drivers can continue their journeys with minimum inconvenience.
Overnight work will begin on Monday 3 March for three weeks, Monday to Friday only, between 10pm and 6am, with a full closure of the A33 southbound between the B3047 and A34.
For vehicles under 5 metres high, a fully signed diversion route will be in place via the B3047, through Winchester town centre to the M3 junction 9 roundabout. Vehicles higher than 5 metres will be diverted east along the B3047 towards Alresford, on the A31 to the A272 Spitfire Link to access the M3 Junction 9 roundabout.
Members of the public should contact the Highways Agency Information Line on 0300 123 5000
Journalists should contact the Highways Agency press office on 0844 693 1448 and use the menu to speak to the most appropriate press officer