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this is a quote from another forum
I live in Mass., and we're right next door to NH, which does not require motor vehicle liability insurance. The rule in MA is that if you live out of state and drive on MA roads more than 30 days in a year, your'e required to have MV liability insurance. They have no real way of checking but if you work in MA that's probably a dead giveaway.
Also, if you live in MA and have only statutory minimum liability insurance here, your coverage is not valid outside the state. Drive/ride into NH and you're not covered. Fortunately bumping up your coverage limits a little so that you're carrying more than statutory minimums is not expensive.