11/12/2017.New Green Luas line. Pictured is Luas light rail tram in Dublin city centre this afternoon. Today marks the first weekday of the luas in operation in the city centre and road users along O’Connell Street, College Green and Dame Street have experienced significant delays as a result of the signal failure. This caused major rush hour traffic disruptions in Dublin city centre this morning due to a signal failure. Photo:Leah Farrell/RollingNews.ie