bza

when a vehicle is being used for ambulance or national blood service purposes or for the purpose of providing a response to an emergency at the request of an NHS ambulance service and the observance of the prohibition conveyed by the red signal in accordance with sub-paragraph (a) would be likely to hinder the use of that vehicle for the purpose for which it is being used, then sub-paragraph (a) shall not apply to the vehicle, and the red signal shall convey the prohibition that that vehicle shall not proceed beyond the stop line in a manner or at a time likely to endanger any person or to cause the driver of any vehicle proceeding in accordance with the indications of light signals operating in association with the signals displaying the red signal to change its speed or course in order to avoid an accident;