The RACV head of public policy had told 3AW Breakfast he doesn’t believe the Tullamarine tollway will ever be permanently set at 100km/hr, despite numerous upgrades and widening projects.

As reported in the Herald Sun, the speed limit has been raised to 100km/hr along the Tulla for three more hours a day.

Motorists can drive at 100km at 9pm rather than 11pm on weekdays, and at 8pm rather than 10pm on weekends.

When conditions allow, the 100km limit will apply up to 6am, rather than 5am, on weekdays, and up until 9am on Sundays.

RACV general manager of public policy Bryce Prosser told 3AW Breakfast this system is more effective than if the speed limit was permanently set to 100km/hr.

“The main reason you don’t do 100km all the time is because of congestion,” Bryce said.

“This allows them to manage the entire road, meaning the flow will be better.

“You can’t see 4 or 5 km down the road.

“I don’t think it would be (ever set to 100km/hr permanently), the way we’re going in the future is this dynamic speed limit.”

Click PLAY below to hear the full details

Photo: AAP