Federal law is if you are just passing through a state with no intended stops other than gas or such then federal laws apply. Worst case , gun in a locked case unloaded and ammo not in close proximity. You guys may not like what I'm about to say , but it works for me. I dont give a shyt about state to state laws. I carry concealed everywhere I go. I never worry about it. Why? Cause I'm smart. When I'm in a foreign state I make sure that concealed is concealed. Find a method that is truly concealed without an accidental showing. For me that's pocket carry. I obey all traffic laws. I don't speed , I stop at all stop signs and I don't change lanes without signalling. Do not give LEO a chance to pull you over. I never obsess over getting caught cause I never give them a reason. I laugh at the drug dealers that get caught cause they are speeding. Ridiculous. Find yourself a good foolproof method of carry. Then make yourself low profile. I've been doing it for 36 years. Way before concealed carry. Oh , don't talk about it. Don't show it. Its a private thing. I see guys taking it out and showing it to every Tom , Dick , and Harry. If you're that proud of it , leave it at home. Don't show you're girlfriend. If you need to show it to be macho , leave it at home. Once again its a private thing. My wife and kids always know I'm carrying. They never say a word about it. They know. I can't say it enough , its a private thing.