Special cameras that catch drivers illegally using their mobile phones are being used the UK.
It’s the first-time free-standing cameras have been used.
Within three days of being launched on the A30 by Devon and Cornwall Police more than 300 drivers have been caught.
The cameras flag up potential offences but all pictures are viewed by a person.
Adrian Leisk, the head of road safety for Devon and Cornwall Police, said:
“When we trialled this technology last year, we were disappointed by the number of drivers detected not wearing seatbelts.
“The early results from our latest deployment show that there is also a problem with mobile phone use behind the wheel, which is both dangerous and illegal.
“We are employing this new technology to send a clear message to anyone who continues to use their phone behind the wheel – you will get caught.
“While we know the majority of drivers in Devon and Cornwall are safe, respectful and conscientious motorists, sadly there is a minority who are still putting people’s lives at risk.”
Offending drivers are sent a warning letter or a notice of intended prosecution depending on how server the offence is.
There were 48 road deaths and 738 serious injuries on roads recorded in the two counties last year.