Ireland also has those amber flashing arrows - meaning that you can turn left/right but must yeild to any on-coming traffic. Generally they're used to let pedestrians across a slip road (i.e. the lights go red intermitently for a crossing and then back to flashing orange arrow) or in various junction set ups.
Loads of UK tourists seem totally confused by the flashing red and the orange flashing arrows. they presume that Ireland should obey UK rules (not an entirely stupid presumption considering that we do drive on the left too) and I've seen people drive thru flashing orange arrows into traffic and one incident of a guy driving thru flashing red at speed into a police car while hurling abuse about broken traffic lights! (they slip into flashing sequence during the night) needless to say he didn't get much sympathy from the police!
