The view from the lorry cab allows officers to see down into cars and watch drivers calling, texting or using their mobile phones.
Officers driving the lorry act as spotters before a marked police car behind stops the driver.
Below are a few examples of their collars so far...
1. The only thing giving this truck away is the flashing blue lights
"Our turn in @HighwaysEngland unmarked truck. No point making a secret about it - it doesn't stop us catching those drivers who still use their mobile phone at the wheel. Including 2 drivers today who are already on 9 penalty points - some bans incoming." Photo: Derbyshire Road Policing Unit
2. "One A Class to our impound and one Class A risky driver up for a court appearance soon"
"A38. Driver of this Mercedes spotted by our #OpTramline HGV crew texting and not wearing a seatbelt. Stopped to find it also has no insurance." Photo: Derbyshire Road Policing Unit
3. "Mr Blobby" scaffolding lorry - an accident waiting to happen
"M1. This Mr Blobby scaffolding lorry with all sorts loose on the back. Vehicle prohibited for over 3 hours at the checksite whilst additional vehicle arranged by company" Photo: Derbyshire Road Policing Unit
4. Huge tarmac machine unsecured on back of lorry
"This tarmac machine was relying on gravity to keep it on the truck" Photo: Derbyshire Road Policing Unit