I don't think 'roadrage' is mentioned anywhere in the road traffic act - please correct me if I'm wrong.
Not sure is this link works but the Road Safety Authority has this;
Road rage and aggressive driving
If you display road rage as a driver, it means you have uncontrolled anger that results in intimidation or violence against another driver.
Aggressive driving is inconsiderate, stupid driving. It can involve speeding, tailgating (driving too close behind another vehicle), failing to use an indicator for lane changes, recklessly weaving in and out of traffic and over-use of a horn or flashing headlights.
If another driver is attempting to provoke you, donÕt react. Don't be tempted to speed up, brake or swerve suddenly. This could cause a crash or make other drivers think you are confronting them. Instead, stay calm and remain focused on your driving to complete your journey safely. Always remember that safety is your number one concern.
Report all incidents to your local Garda station or contact Traffic Watch on: Lo-Call 1890 205 805.