Children travelling to school in Northern Ireland could be put at risk by proposals to move the clock forward, the public transport operator has said.
Time would move forward by an hour from GMT in the winter and a further hour in the summer, to match Central European Time, meaning lighter nights but darker mornings.
Westminster is considering the move, which proponents like sports organisations say would improve tourism and encourage outdoor activities in the evenings.
Bus and train company Translink said: "This is potentially more risky for vulnerable groups such as schoolchildren."
MP Rebecca Harris is championing the Daylight Saving Bill. The Northern Ireland Affairs Committee of MPs is considering the implications of her Private Members Bill for Ulster.