Final answer:
The maximum allowable speed for special purpose vehicles on the flight line is typically between 5 and 25 miles per hour (mph).
Step-by-step explanation:
The maximum allowable speed for special purpose vehicles on the flight line may vary depending on the specific regulations set by the airport or aviation authority. However, in general, the maximum speed limit for special purpose vehicles on the flight line is typically between 5 and 25 miles per hour (mph).
It is important to note that the flight line is a restricted area at airports where aircraft operations take place. The lower speed limit ensures the safety of both the special purpose vehicles and the aircraft.