Right after Batman and Vale escape from the Museum, Batman and Vale get out of the Batmobile, and run from the Joker's goons. Batman then calls for the Batmobile by remote control. As the Batmobile heads towards Batman, you can see a hand driving the Batmobile. So a Remote Control Batmobile? I doubt it!
I just watched that scene like three times and I didnt see any hand operating the sterring wheel when he ordered the car to come to him. i think what you saw as a hand was the refelctions of the pedestrians as they darted out of the way of the car.
This is one that I noticed recently myself watching the film on a large HD television. After batman calls for the car there's a closeup shot of the Batmobile pulling away from the police and you can see the driver's hand on the steering wheel. You have to really pay close attention to this because it's only on screen for a second or two. I'm going to upload a photo of it.