Nearly 600 cyclists received on-the-spot fines for cycling offences in the first six-months of the new penalty regime.
Fines were introduced for seven offences at the end of last July and 577 people were issued with a fine by the end of January.
According to the Irish Times, breaking red lights was the most common offence for which 330 fines were issued, 125 did not have a front or back light after dark and a further 70 people were found to be riding without due care and attention.
Notices unpaid after 28 days are raised to €60, and if this is not paid, cyclists can end up in court facing a €2,000 fine.
More than 20,000 fines were issued to speeding motorists during the same period.