Gardaí have moved to prosecute several Dublin taxis for not using the shortest route.
Eleven drivers were caught during a series of checkpoints carried out in recent weeks.
Gardaí say this offence results in a prosecution via summons and carries a fine of up to €2,500.
While five other detections were made for overcharging customers.
These drivers will see a fixed charge penalty notice, which carries a €60 fine.
Gardaí say these types of operations will continue for the summer months.