This road is currently closed in Northbound direction only, North of the "Asda" roundabout - junction with Purbrook Way. One lane of Purbrook road, headed East and normally turning left onto Hulbert Road is also closed. I assume the closure goes as far as the new roundabout just South of the junction with A3(M) J3.
Dates on a sign show 24th July to 16th September.

https://www.waze.com/en-GB/livemap?zoom ... on=-1.0107

The official diversion signs appear to point to a very long alternative route, going through Waterlooville. Waze should be able to find a much better one!