A provision of these Rules does not apply to the driver of an emergency vehicle if--(a) in the circumstances--(i) the driver is taking reasonable care, and(ii) it is reasonable that the rule should not apply, and(b) if the vehicle is a motor vehicle that is moving--the vehicle is displaying a blue or red flashing light or sounding an alarm.
Note--:
"Emergency vehicle" and
"motor vehicle" are defined in the Dictionary.