The first of Melbourne's new permanent bollards will be installed in the CBD, 10 months after the Bourke Street attack.
The stainless steel bollards will be installed at the Swanston and Elizabeth street corners of the Bourke Street Mall, as part of the government's $10 million CBD security upgrade.
Fixed planter boxes will be placed in other areas of the mall to help protect against vehicle attacks.
"With 720 tram movements and up to 75,000 pedestrian movements per day, as well as necessary access for emergency vehicles and deliveries, a 'ring of steel' configuration would not have been possible at Bourke Street Mall," Melbourne Lord Mayor Robert Doyle said.
"The emphasis is on creating comprehensive safe zones to protect people from a hostile vehicle attack."
The bollards have been crash rated and can withstand significant vehicle force. They will replace temporary barriers installed in June.
Bourke Street Mall is the first of nine sites to receive permanent protective barriers. The remaining locations will be upgraded over the next year.
Minister for Police Lisa Neville said while there was no way to completely eliminate risk, "we are doing everything we can to keep pedestrians safe".