and I get that if you own the car you have to register it here. but in these cases, the person driving the car doesn't own it. the LLC that is registered in another state owns it.#Fact, when I moved to GA in 2005 (October), I got pulled over for speeding. The officer gave me a warning because I still had OK tags on my vehicle but had a GA address, it was around the middle of November. He said exactly what you wrote - "30 days".

