The four-lane upgrade of the Telegraph Road corridor in Brisbane's north has been completed under-budget, Brisbane Lord Mayor Graham Quirk says.

The suburban arterial road running through Bracken Ridge, linking Carseldine and Deagon and surrounding suburbs, was originally budgeted for a $260 million upgrade.

However, Cr Quirk says the project has been delivered with savings of $100 million from the original budget, which will be reinvested into citywide projects, including the Green Camp Road, Waterworks Road and Wolston Creek Bridge upgrades.