No cars will be able to get into Melbourne's Swanston St during the Melbourne Cup parade as the city ramps up efforts to stop "hostile vehicle attacks".
The hefty barriers are the start of plans that will allow police to shut down the entry and exit points to the city in the case of an attack.
"Monday, you will not be able to get a vehicle of any kind into Swanston Street," Lord Mayor Robert Doyle told 3AW on Thursday.
"This will actually be protective measures so that even if there was a hostile vehicle you couldn't get through."
After a driver killed six people and injured dozens of others in the Bourke Street mall in January, temporary bollards were installed at locations across the city.
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Mr Doyle is going to London for a meeting of mayors whose cities have had fatal vehicle attacks, and plans to return with fresh ideas for protecting Melbourne.
"In London they actually know how to control the entry and exit points of the city, if they have to shut down the city," he said.
"That's a terrifying thought ... (but) we'll put some of that into practice ... next Monday."
Permanent replacements for the temporary bollards installed on Bourke Street will be announced before Christmas, while Victoria Police has identified nine CBD locations that need protection.
