More than 25,000 vehicles crossing the two Severn bridges on Wednesday had their registration plates scanned as part of a police operation. Police used Automatic Number Plate Recognition (ANPR) units which alert officers to any crime the vehicle or its occupants are wanted for.
A similar exercise run in July saw 450 vehicles stopped and 46 arrests.
Officials from nine other government agencies joined more than 100 police officers from four forces.
Afterwards police said more than 110 vehicles were stopped, 11 people arrested and 19 vehicles seized.
A spokesman said: "One person was arrested on suspicion of possession with intent to supply Class A drugs, three for driving while disqualified, three for possession of cannabis, two for possession of offensive weapons, one for being wanted on warrant and one for drink driving.
"In addition, 16 vehicles were seized for having no insurance, one articulated lorry was seized for having a fraudulent excise licence. Two further vehicles were seized by HM Revenue and Customs for using illegal fuel.
"The Vehicle and Operator Services Agency (VOSA) has served 36 prohibition notices on unroadworthy vehicles and the Department for Work and Pensions (DWP) is dealing with two people for benefit fraud."
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