A number of drivers were fined over the weekend after being checked by gardai, RSA officers and Customs at a special checkpoint.
Officers from the multiple agencies set up along the N4 near Boyle in Co Roscommon on Saturday.
Drivers were checked for all the basics like tax and insurance, but motorist's diesel and tachographs were also checked.
One driver at the checkpoint was found to be using green diesel and will appear in court at a later date.
A garda spokesperson said: "Gardaí conducted a checkpoint on the N4 at Boyle with @RSAIreland & Customs. RSA vehicle & tachograph inspectors examined a number of vehicles. Of note, 1 driver using another person’s tachograph card and 1 driver using green diesel in private car Proceedings to follow."
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