Helicopter to zap speeding drivers

3 hours ago
Motorists are being warned that they could be caught speeding by a police helicopter armed with a radar detection device.
More that 20 signs are being put up in Essex telling drivers that police are watching from the sky.
Essex County Council - which is erecting the helicopter warning signs - says the aircraft is equipped with a "skyshout" public address system which could be used to "warn of a detection".