Yeah FM boradcast drive ins are pretty popular in Pennsylvania. I don't know what state you are in. They dont care if you run your car, I don't let mine run for more then 30 mintues at a time though. Its pretty cool out where I live. Its like stadium seating so the peoples cars in front of you dont block you. Only thing you aren't allowed to do is leave your headlights on (for obvious reasons). Here is a really really good tip. If you go and it might rain.... get some Rain-X. If you put rain-x on your windows, you wont need to keep putting your windshield wipers on to see the movie. I always bring a bottle and a rag just in case, it rains about 25% of the time I go to the drive in.