They get in the car. Batman starts the batmobile, they go to the Batman's cave, and at one point Batman says: “ – Automobile! Blind mode!” and the batmobile’s windows have been covered so neither the people inside the car and neither the people from outside to not see nothing ( the people from inside to not see where is the Batman’s cave; and the people from outside to not see who is in the batmobile).
Only Batman can see through those windows, because he has special glasses for those windows.
Rival Billionaires Tony Stark and Bruce Wayne, have more than their businesses in common. As Iron Man and Batman they continuously battle each other, until each of them meet their greatest foe, which brings the two titans together to join forces, to try to save the world.