Op Tramline: Wiltshire Police catch motorists breaking the law on the M4
More than 40 motorists were pulled over and caught breaking the law
Wiltshire Police have been using a an unmarked HGV to catch drivers breaking the law on the county's roads.
More than 40 motorists were pulled over and caught breaking the law as part of the three-day mission - part of Operation Tramline.
In one case, one driver now faces the prospect of losing his licence after officers made a significant discovery.
Upon returning to Badbury Weighbridge, officers noticed a strong smell of cannabis coming from his van and the driver was arrested on suspicion of drug driving as he failed a roadside breath test. He has been released under investigation.
The three-day operation was carried out using Operation Tramline HGV cabs. These are unmarked vehicles owned by National Highways for use by police forces to patrol motorways and major A-roads across the country.
PC Luke Hobbs, from Wiltshire's Roads Policing Unit, said: "Cases like this prove how offences which, on the surface, may seem minor can often reveal a pattern of serious criminality."