Md. Code, Transportation § 21–1109

(a) Unless he is on official business, the driver of a vehicle may not:

(1) Follow within 500 feet of any fire apparatus traveling in response to a fire alarm; or

(2) Drive or park within 300 feet of any fire apparatus stopped in response to a fire alarm.

(b) The driver of a vehicle may not pass an emergency vehicle within 100 feet of an entrance ramp of a fire or rescue station when the emergency vehicle is in the process of parking or backing.