End of story.
Does a public bus transit the facility?
I used to work at a federal facility that had a public bus transit it. There were two gates. Their was a bus stop at either gate. The bus would stop at one, people would get off, show their ID, then enter on foot. The bus would continue through the installation not stopping and exit the other gate where it would stop, again discharging any passengers who wanted to enter that gate. They would get off and show their ID, then enter on foot. The bus would continue on. At no time were the other passengers on the bus stopped, detained, or otherwise hassled about ID or anything else. Anyone could ride it.