Person who drives as if his or her car were an ambulance, fire truck, or police car--disregarding traffic laws and honking at anyone who isn't sufficiently exceeding the speed limit. Example: That guy who just cut across three lanes of traffic to get to the exit must be an undercover emergency driver.
UNDERCOVER EMERGENCY DRIVER (
Meaning of UNDERCOVER EMERGENCY DRIVER ( in English
Slang English vocab. Английский сленговый словарь. 2012