Ananova:

Austrian police are testing a Porsche 911 as a traffic control car to help prevent motorists from speeding.

A spokesman said the £65,000 sports car, than can do up to 177mph, had been a major success and they are planning to buy more.

He said: "The preventive effect is excellent. Drivers just needed to see it parked alongside the road and they slammed on the brakes.

"The only thing is that it's a bit cramped. But there's still enough space for the essential equipment like the speeding radar and the breathalyser."