Sin stock security There is a separate entrance to the runways and cleanliness. 16.30-17.30 are time period appropriate for the exercise and to avoid problems installation truck.
Safety, health, property A separate path to the runway. Cleanliness And others in the period 16:30 to 17:30 is the time for exercise. And to avoid traffic jams.
Security of property. A separate passage with the runway, cleaning and so on during 16.30-17.30 is the time for exercise. And to avoid the traffic jam problem.