VICROADS will review Princes Fwy entrances between Geelong and Melbourne after the wrong-way collision that killed five at Lara.

The review came as a police source revealed yesterday another motorist had been nabbed driving on the wrong side of the freeway just 24 hours after the December 8 accident.

Roads Minister Terry Mulder said any incident involving a vehicle on the wrong side of the road put lives at risk.

"As a result of recent events, I have asked VicRoads to review all access points on the Princes Freeway between Geelong and Melbourne," Mr Mulder said.

"This review will assess road infrastructure, such as signage and line marking, to ensure they achieve national standards."

Specialist crash investigators are continuing to probe why Sarah Houlihan, 32, drove the wrong way on the Princes Freeway before slamming into an oncoming car at high speed.

The Roxburgh Park woman died when her BMW collided with a car full of friends near Avalon Rd on December 8.

Also killed were Hoppers Crossing mum Casey Valetic, 24, her best friend Melissa Parry, 23, of Werribee, and mates Brad Dickson, 23, and Nathan Kerr, 23. Two other men in the Subaru, also from Werribee, were taken to The Alfred hospital, one by air ambulance in a critical condition.

One man has since been discharged from hospital.

A Geelong man, who didn't wish to be named, said he had almost accidentally ended up on the wrong side of the freeway more than once.

"Out on Geelong Ring Road, off Bacchus Marsh Rd in particular, there is a sign that says turn right to go to Melbourne. But the next right is the off ramp; it is the second right that you need," he said.

"The same thing happens on the Ballarat Rd exit and Hamilton Highway exit. Some serious signage changes need to be made."

VicRoads regional director William Tieppo confirmed there would be a review.

He said it would assess road infrastructure such as signs and line markings to ensure they achieved national standards.

He urged motorists to take care and to drive safely, particularly over the approaching holiday period.

Motorists can report any road hazards to VicRoads on 131 170 or to police by calling 000.

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