Portsmouth City Council is searching for a design and build contractor for a £70M highways scheme.
The project involves realigning the A3 from the M275 into the city centre, replacing three roundabouts, and constructing a new access road.
The deadline for submitting tenders is 7 September and the contractor will be named on 30 October. Work is expected to start between July and September next year and construction will take two years.
Planning permission has been granted for the scheme which aims to minimise traffic congestion and improve the reliability of journey times, to prioritise cyclists and pedestrians at junctions and crossing points, simplify the road network, open up significant areas of land for potential new development and improve the quality of the environment.
Launching the public consultation in October last year council leader Donna Jones said: “Realigning the road enables areas currently separated by busy traffic to become one cohesive space people can enjoy.
“This will ensure the existing Commercial Road area becomes part of a bigger city centre development area.”