Drivers who use hand-held mobile phones while driving are being targeted in a month-long crackdown.
Durham Police warn drivers caught using their phones illegally while behind the wheel face a £30 fixed penalty ticket rather than just a verbal warning.
The law banning the use of hand-held mobile phones was introduced in December 2003.
But the force is concerned that the legislation is still being widely ignored by drivers.
Head of the force's road policing unit, Chief Insp Paul Goundry said: "The law banning motorists from using a mobile while driving was introduced to increase public safety.
"I am very concerned that this legislation is still being widely ignored by members of the public, including many professional drivers.
"That is why throughout this month officers will be taking a hardline approach to those who flout the law."