Chaos is expected to reign on Saturday when hundreds of thousands of sport fans descend on Melbourne as the Grand Prix and 2017 AFL season get underway.
Two AFL matches on Saturday afternoon and the first qualifying day of the grand prix will see the public transport network swamped by tourists and locals alike.
Tram stops in the city on Friday afternoon heaved with people, as motoring fans flocked to Albert Park to see the first day of grand prix festivities.
Saturday afternoon will be a true test of the city's public transport system as the MCG, Etihad Stadium and Albert Park play host to major sporting events simultaneously.
An estimated 80,000 people are expected to travel to the MCG on Saturday night to see Essendon square off with Hawthorn at 7.25pm.
Across the city, an estimated 40,000 footy fans will be leaving Etihad Stadium in Docklands after watching St Kilda play Melbourne.
A few kilometres away at Albert Park, hundreds of thousands of Formula 1 fans will also be heading back into the city as the first qualifying race concludes at 6pm and the gates close at 8pm.
During the peak window of 4.30pm and 8.30pm, trams will run every minute between gates 1, 2 and 3 of Albert Park and the CBD.
Closures on the Calder and West Gate freeways on Saturday night could also see Melbourne's roads plunged into chaos.
It's the busiest weekend of the year for Yarra Trams, with the tram network calling in 1500 of its 2200-strong workforce to deal with the march of sport fans.
The grand prix is expected to draw well over 270,000 patrons across four days, 75 per cent of whom will travel by tram.
Friday was the busiest day of the entire year for the tram network due to the regular weekday demand combined with the grand prix's opening day and the AFL opening match between Collingwood and reigning premiers Western Bulldogs at the MCG.
A Yarra Trams spokesperson praised the smooth run of trams despite scenes of chaos opposite Southern Cross Station where a free shuttle is running between the city and Albert Park.
"Overall the day has gone well thanks to our operations centre monitoring the network making real-time adjustments to services as required," he said.
An extra 2000 services ran to Albert Park on Friday, in addition to the thousands of regular services across the network.
More than 200 customer service employees and operations officers will also be on the network to help with crowd control at flooded tram stops.
A network of temporary cameras has also been set up for the event to monitor congestion along the city's main thoroughfares.
Albert Park and all roads within it, including Lakeside Drive, will be shut until Tuesday, March 28.
Major thoroughfares including Queens Road, Canterbury Road and Fitzroy Street will remain open, but VicRoads is expecting crowds departing trams on St Kilda Road to bring traffic heading to and from St Kilda to a halt at times.
"I suspect in places the pedestrians will take over the roads," said VicRoads manager of real-time operations Keith Weegberg.
"It will be very crowded on Queens Road and on Albert Road where the other shuttles are going down."
Both the Calder and West Gate freeways will be closed for several hours on Saturday night for roadworks. The Calder will be closed in both directions between Kings Road and Keilor Park Drive for power cable relocation between 9pm on Saturday and 8.30am on Sunday.
Although the football is expected to draw big crowds, two events which gave the grand prix organisers trouble last year have been moved. A large fun run and the Melbourne International Flower & Garden Show have both been moved to different dates to cut down on the number of commuters trying to get around the city.
"The GP crowd and the flower crowd are probably not the same crowd," Mr Weegberg said. "It's probably not a choice for them going to one or the other."
- with Liam Mannix