Cyclists who break the rules of the road and get caught face €40 fines for a range of offences from today onwards.
These include breaking a red light, no front or rear lights when cycling in the dark, and cycling in a pedestrian street or area.
Other punishable offences are failing to stop for a school warden sign, cycling without reasonable consideration, cycling beyond a stop line or barrier at a level crossing, lifting bridge, or swing bridge when red lights are flashing.