According to freedom of information documents, it's a 15% increase on 2018, when just over 5,100 people settled fines.
You get at least three penalty points for the offence, and a minimum fine of €60.
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The Road Safety Authority's Brian Farrell says these drivers are putting lives at risk.
"If you are driving a vehicle that is unsafe, it means that in the event of an incident or a serious issue on the roads, the vehicle is not going to do what it's supposed to, and that's help you avoid that collision."
