A gadget that alerts speeding drivers when emergency vehicles has faced calls by police and motoring organisations to be banned.
The £799.99 Target Blu Eye is a dashboard-mounted device which, astonishingly, is perfectly legal, according to its makers.
It can detect when police cars – even unmarked vehicles – are more than half a mile away by picking up encoded radio signals, and then sends a warning to the motorist.
When a 999 vehicle is within 1,200 yards, it sets off a green light on the display. As it gets nearer, the lights go to amber and finally they go red when it is just yards away. The device can even detect the radio signals from police officers on the beat and force helicopters.