It might give you a warm-fuzzy feeling… literally that is… but according to AAA, idling doesn’t help your car much, and in fact, it offers a really great opportunity for thieves. In many areas, it is illegal to idle an unattended vehicle. Minneapolis law for instance, prohibits idling a car for more than three minutes in a one-hour period, or for more than 15 consecutive minutes in any one-hour period when temperatures are at zero or below. But many people are tempted to let their vehicles warm up before hitting the road. AAA says it isn’t necessary and in fact, may be harmful, and police warn that it’s risky.