Motorists are being warned to stop breaking red lights at Luas line junctions, after a sharp rise in collisions.
There were 38 collisions between motorists and the Dublin trams in 2013, compared with 24 the year before.
There have been 13 collisions between drivers and trams so far this year
A Luas 'What's The Harm' safety campaign being launched today highlights the message.
Transdev operate the Luas. Communications manager Dervla Brophy said mistakes could be lethal.
"When you break a red light, you can seriously injure (or even) kill somebody," she said.
More than 90% of road vehicle / tram collisions happened on the Luas Red Line, while 10% happened on the Luas Green Line.
More than 60% of road vehicle / tram collisions happened in the city centre section of the Luas Red Line between Heuston and Connolly stops.