Batman: Arkham Knight - Every Screenshot You Need To See
18. The Batmobile Is Equipped To Carry Passengers
In the ACE Chemicals footage Bats is shown carrying a selection of hostages away from danger by storing them in the back of his Batmobile.
It's more than likely this will be a regular side mission, seeing you dart off to a known location and take anyone in need back to Commissioner Gordon or a bridge out the city.