This stretch limo Batmobile is what Batman and Robin ride around in on their off hours. Maybe Bruce wants to take Robin out for some Ice cream or to the opera. Nothing wrong with a rich dude taking his child ward out on the town in a stretch limo is there? I mean sure, you could take a lady friend, but…We’ll you and boy wonder have an odd relationship.
Maybe they have the Joker in the trunk. Who knows. What I do know is that Bruce Wayne sure knows how to travel in style while giving away his secret identity.