Police were focusing on the safety of coach passengers travelling on the M1 on Thursday, August 1.
Officers were inspecting vehicles for roadworthiness and carrying out checks on drivers. They were also disrupting any groups involved in organised crime.
Typically, there is an increase in the number of incidents involving coaches transporting both holiday makers and workers at this time of year, often taking the form of collisions.
A total of 21 vehicles were stopped - 16 of these were coaches and minibuses. Among those, a minibus driver was reported for driving licence and operator offences.
Five vans were stopped, one of which was seized for having no insurance and for running on red diesel – the consequence being a £540 fine. In addition, because of tyre offences, the van was stopped from continuing on its journey.
The final van stopped was overloaded with alcohol and the van was seized. The driver was arrested for fraudulent documentation.
Sergeant Mahesh Patel from the Force’s Roads Policing Unit, said: “Overall this was a very successful day. Members of the public from far and wide witnessed Northamptonshire Police completing checks and offering reassurance.
“Because of our position in the country there are a large number of coaches passing through, particularly at this time of year. The safety of these and other road users is paramount.”