I've driven in SF and SF doesn't compare to LA. Just keep in mind that in LA, there's always a traffic jam somewhere either because of road work/construction or an accident. Many times, there will be traffic and there actually won't be for any reason. Keep in mind too that the busiest freeway in America is the 10 freeway in LA. It's simply just a lot of people in LA and everybody drives. CA is the car capital of the US and LA is specifically the car capital. Nobody uses public transportation unless you don't own a car. With that said, there's nothing to be scared about. People do drive faster and tighter but as long as you go with the flow, you'll be good. Since you're not familiar with the roads and area, I would suggest to have your passengar mess with the GPS because if you drive slow in traffic, you may get some honks and some birdies. LA is not forgiving when it comes to slow drivers.