Bad idea, more and more people getting busted by scanners, not sure if they have these but trust me when I say you dont want to get caught out of town with weed. Getting caught at home is bad enough but trying to transport a small amount with no benifit other than a few joints is way too much of a risk.
It's hard to say what the safest way to traffic large amounts is.. If you're not at all suspicious looking (like a soccer mom with a clean record) and can stay really cool under pressure then I'd assume a car.. If you aren't an unlikely trafficker then I'd suspect bus or train.. But I'd rather keep it small enough to go carry-on.. Your luggage is more likely to be sniffed when you aren't holding it..