Erratic driver caused dramatic Melbourne lockdown

A man has been arrested after driving erratically with multiple roads in Melbourne's CBD put into lockdown but police say the incident wasn't terror-related.

The 26-year-old was arrested without incident and no one was hurt, in stark contrast to the 2017 Bourke St massacre and a similar vehicle attack later that year, also on Flinders St.

After stopping his car outside Flinders St train station at the intersection with Swanston St on Wednesday afternoon, the man climbed onto the roof of a silver sedan and yelled for police to get him.

He then returned to the car and did a doughnut, repeating the actions at the same intersection of James Gargasoulas who then mowed down and killed six pedestrians in his car in Bourke St three years ago.

"The vehicle has then done a circle within the intersection, he stalled the vehicle and then drove down to the intersection ... at Flinders and Williams streets where he stopped, put his hazard lights on and police intercepted him," Superintendent Dan Trimble told reporters at the scene.

The man had no weapons on him and no one was injured.