WHEN a huge kangaroo came flying through Neville Black's window, smashing glass and landing in his lap, he wished he'd known about the simple solution he now swears by.

Having a kangaroo "tangled up in your steering wheel and trying to kick its way out” is a terrifying memory that has never left Mr Black.

But it took three more dangerous run-ins with kangaroos for him to discover a small, simple device that he thinks could save the lives of humans and animals.

Retailing at less that $10, Mr Black said the solution lay in a "sonic guard”, designed to generate a piercing whine which deters kangaroos and other wildlife from jumping in front of cars.

"Since we have used this, we have never hit a kangaroo,” Mr Black said.

With more kangaroos on the roads in drought, Mr Black predicts the problem will get much worse.

Warwick panel beater Joshua Robertson has reported a higher number of animal-related car repairs coming into his workshop.

He said the average cost of animal damage was between $2500 and $7000 and worse damage resulted when drivers swerved to miss the animal.

Working for years as a Driver Reviver volunteer, Mr Black and his wife, Brenda, have seen just how much damage kangaroos can do.

"They can really, really mess up your car,” Mrs Black said.

The couple wished more people utilised what they said was a simple and cost-effective solution.

The sonic guard devices, which are attached to the front bumper of cars, claim to work when drivers are travelling at speeds of 50km/h or more.

A high-frequency sound emitted by the device can be heard 2km away, and are said to warn animals away from vehicles.

"Neville was even going to speak to the Department of Transport about making them a requirement when you register your car,” Mrs Black said.

But not everyone is completely convinced the sonic guard devices are effective.

Purshouse Rural salesman Marty Kerlin said he'd still had collisions with kangaroos while using the product.

"Roos and wallabies are around in bigger numbers than I have seen in quite a while,” he said.

"That is a concern in road safety when the days are short people are driving home at 5.30pm, on dusk when roos are coming out more.

"I don't know what science is involved or how affective they are.”