You can leave your registration and insurance in the car. Just cut out the address, if you get pulled over the cop will run your plates and get your address which should match your drivers license. I got pulled over, when the cop asked why I cut my address out he stated that was a good idea and he never thought of that. It's legal, all you need is proof of registration and insurance, no address is needed on the proof. Another tip, do not carry a spare house key in your purse. If you're purse gets stolen the thief has your address from your drivers license and your house key. Isn't it sad what we have to do today to protect ourselves and the things we worked hard for.