Sections of major CBD roads will be closed for up to five years as work gets under way to build the Melbourne Metro Rail tunnel.

By February next year, Franklin Street will be closed between Swanston and Victoria streets. And A'Beckett Street will close between Swanston and Stewart streets.

These closures will remain in place for five years so the new CBD North Station can be built.

Parking will be removed near intersections on Latrobe Street between Exhibition and King streets in an effort to improve the flow of traffic.