Extra police are patrolling Brisbane's Airport Link Tunnel after it finally opened to traffic minutes before midnight.
The opening came after years of construction and cost blowouts on the $4.8 billion project - Australia's largest infrastructure project.
Police vehicles were the first to travel though the 6.7-kilometre toll road from the Brisbane CBD to the airport.
Police expect a few teething problems as drivers test it out for the first time today.
Acting Superintendent Craig Hanlon says the six speed cameras in the tunnel have been switched on.
But he says drivers will only be fined once if they are caught speeding multiple times.
"However that infringement notice will be for the highest speed that they're detected travelling at within the tunnel," he said.
The tunnel will be free to use until mid-October for drivers with toll accounts.
It will be free for all drivers until August 22.