Somehow it seems one of my dreamsigns is cars.
I my first LD, i was somewhereon the sidewalk, and i picked up a rock and was going to throw it at a car, until i thought of how stupid that was.
Another LD, there were a bunch of cars driving around in a strip of land behind my house, and i realized they shouldn't be there.
I can think of 2 more dreams with lots of cars driving down the street, and when i'm outside theres always a car somewhere in a driveway or something.
As a side note, school buses have police lights on their hoods in my dreams.