A "bottleneck" roundabout in the Moreton Bay region that has left motorists "fed up for many, many years" will be given a $30 million upgrade having been allocated funding in the upcoming state budget.

Fairfax Media can reveal the state government will announce on Monday the Petrie roundabout will be replaced by a reconfigured T-intersection featuring traffic lights, with work set to begin in 2020.

However, the Opposition Leader said the roundabout upgrades needed to be finished by 2020 because the new University of Sunshine Coast campus will open at the start of that year.

The Petrie roundabout connecting Gympie Road, Dayboro Road and Anzac Avenue. Credit:Google Maps

Transport and Main Roads Minister Mark Bailey said an extra $22.5 million will be set aside in the state budget, set to be delivered on June 12, in addition to $7.5 million already committed.