304.890.  Definitions. — As used in sections 304.890 to 304.894, the following terms shall mean:

  (1)  "Active emergency", any incident occurring on a highway, as the term highway is defined in section 302.010, that requires emergency services from any emergency responder;

  (2)  "Active emergency zone", any area upon or around any highway, which is visibly marked by emergency responders performing work for the purpose of emergency response, and where an active emergency, or incident removal, is temporarily occurring.  This area includes the lanes of highway leading up to an active emergency or incident removal, beginning within three hundred feet of visual sighting of:

  (a)  Appropriate signs or traffic control devices posted or placed by emergency responders; or

  (b)  An emergency vehicle displaying active emergency lights or signals;

  (3)  "Emergency responder", any law enforcement officer, paid or volunteer firefighter, first responder, emergency medical worker, tow truck operator, or other emergency personnel responding to an emergency on a highway.