The Department has made no such assessment. Ambulances on emergency business are already generally allowed to use bus lanes through an exemption in the underlying Traffic Regulation Order (TRO) which creates a bus lane. Local authorities can extend this to ambulances on non-emergency business if they wish, but will need to consider whether the vehicles are easily identifiable for enforcement purposes, and the impact on the operation of the lane for buses. Local authorities are best placed to judge how best to operate bus lanes on their road networks. Bus lanes are provided to give buses priority over other traffic, particularly at congested times of day, and to provide bus passengers with a more reliable service. Allowing more vehicle types to use a bus lane may start to erode this priority.