Emergency vehicles must always assume that a runway is being used for air traffic, even after an emergency landing. They must wait until cleared by the tower before moving onto the runway and not assume they can go once the emergency craft has landed.
None
True
The question is incomplete. There are no options given (for "which of the following") to answer this question.
None of the above
None of the above have permission to croos the runway without contacting the Control Tower for approval
Answer is all the above emergency response vehicles responding to an emergency taxiing aircraft aircraft being towed
The term "Heavy" in aviation refers to a big aircraft, generally anything larger than a Boeing 757 or Airbus A321
An aircraft coming in for landing would normally have the right of way over all other aircraft or vehicles unless there is an emergency situation, in which case those involved in the emergency have right of way.
none of the above
none of the above
Depending on the airport and the regulations in place, any vehicle can cross the runway provided it is in radio communication with the tower and has had clearance to cross. The would also need to advise the tower when they had cleared or "vacated" the runway. In an emergency, the main vehicles given permission to cross or even enter the runway would be the "crash" trucks and the ATC supervisor. They would still need permission to enter the runway.
The cast of Aircraft Emergency - 2000 includes: Mary Nightingale as Presenter