A Fianna Fáil TD has taken a simulated driving test in which his response times were faster after a few drinks.
However, Bobby Aylward says the simulated driving tests he took do not represent the complexity of driving a real car.
It follows a claim by FF's Mattie McGrath on Newstalk Radio that people feel more relaxed behind the wheel after a drink and therefore drive better
Transport Minister Noel Dempsey recently sparked controversy when he proposed to lower the legal blood-alcohol limit.
Mr Aylward said that "knowing you are about to brake as part of an exercise" cannot reflect the true nature of being behind the wheel of a real car.