Brisbane's Inner City Bypass will be widened in parts from six to eight lanes in a major new infrastructure project in Lord Mayor Graham Quirk's final council budget of his current term.

Cr Quirk said the $80 million project, which would see the south-westbound and a section of the north-eastbound carriageways widened from three to four lanes, should be completed in 2018.

The Brisbane City Council is planning $80 million worth of upgrades to the Inner City Bypass. Credit:Aerial Advantage

The $80 million would be spent over three years, with the preliminary design work and the contract tender process expected to be completed in time for work to begin in 2016.

Along with the widening, Cr Quirk said Brisbane City Council would investigate whether a new ramp could be connected to Bowen Bridge Road, allowing motorists and bus commuters to have a direct link to the new Legacy Way tunnel.