Sen Sgt Rowe said action was needed to improve the road known as the "corridor of death" and all drivers needed to be vigilant.

Sen Sgt Rowe's call for action comes after a three Ballarat people were involved in a head-on collision near Lethbridge about 3.20pm Saturday.

"Something's got to happen soon in relation to that highway, and it's got to rest with VicRoads," he said.

"Although some enhancements have been made there are other problems still to be addressed.

"We want some passing lanes, and we want some of the dips that hide cars removed."

Police have said drivers get frustrated by the lack of overtaking lanes - there are two between Ballarat and Geelong - and risk overtaking in dangerous places.

"Come on VicRoads, let's get our act together," Sen Sgt Rowe said.

"There's plenty of room down there to put the passing lanes in."

VicRoads assesses roads and makes recommendations to the State Government, which provides money for improvements.

The government has funded $1.5 million in upgrades to the highway for the 2004-05 and 2005-06 financial years.

None of the funding will go toward building extra overtaking lanes and reducing the number of dips.

Sen Sgt Rowe said the public should be getting the message about the dangers of the highway.

"Anyone who has not seen the warnings must have been on Mars," he said.

"Some people just don't take any notice.

"A split-second of inattention can lead to disaster.

"We patrol it as much as we possibly can, we can't be there 24 hours a day."

Sen Sgt Rowe said there was no way to tell how many accidents had been avoided since the increase in patrols, although there had been a quiet spell until the weekend.

The stretch of the Midland Hwy between Ballarat and Geelong has been the site of four fatal crashes this year.

Emergency service officers were amazed all five people survived the crash on Saturday.

Miraculously, a three-month-old baby strapped into a car seat escaped without injury.

Only 24 hours after the crash Ballarat TMU Acting Sergeant Brad Fisher booked six drivers on the Midland Hwy, five for speeding and one for an unregistered trailer.

Victoria's road toll stands at 238, equal to the same time last year.