Though they are in Los Angeles, a city made for cars, the studios have a different kind of transportation. Inside, they use these tiny golf carts to get around. They also use the bycicles a lot, because of some reasons: they don't have to start any engine, they are quick, easy to park, and they don't make any noise. The streets between the Stages and the buildings of the studios aren't actually big avenues, so throwing a car there is also difficult. You may still see some parking lots reserved for the celebrities and some producers.
Examples on images and video:
