Dozens of vehicles were stopped and checked as part of an operation to keep roads safe.
Motor patrols officers from Northumbria Police carried out Operation Dragoon at the Tyne Tunnel to stop and check motorists and vehicles.
They were joined by staff from the Vehicle and Operator Services Agency (VOSA), HM Revenue and Customs (HMRC) Road Fuel Testing Unit and the Tyne Tunnel.
During the eight-hour operation, two vehicles were found to be using red diesel; VOSA issued 11 prohibition notices; nine warnings were issued to drivers; one driver was summonsed for driving with no insurance and 14 verbal warnings were given to motorists for load offences.
Northumbria Police Motor Patrols Sergeant Dave Clement said: “This latest operation was a great success. The majority of road users abide by the law, have the right documentation and drive safely but there are a minority who flout the law.
“It is a priority is to improve road safety and ensuring the roads are a safe place for everyone.”