Another lane of car traffic will be removed at the intersection of Swanston and Flinders streets, as works begin on permanent security bollards in front of Flinders Street Station.

Cars coming from St Kilda Road and turning left off Swanston Street into Flinders Street will now have to share their lane with other motorists turning right.

The works are scheduled to begin on Monday, and the permanent change is likely to increase travel times for drivers at peak periods.

An artist's impression of the new forecourt outside Flinders Street Station once permanent bollards go in. Credit:Victorian government

Melbourne City Council in its statement about changes at the intersection encouraged motorists to "allow extra time" when travelling through the area.