Edmunds provide some guideline on how to determine the amount of auto insurance cover you need. Call me risk-averse, but I have 100/500 liability coverage from my car insurance and another $1M from my umbrella insurance. It is better be careful.

Even though each state has minimum (or no) requirements for bodily injury liability, it is probably in your best interest to purchase higher limits. If someone else is injured and you're at fault, the minimum liability coverage may not cover their medical expenses, in which case their attorney will most likely come after your assets. It is generally recommended (by insurance companies - who else?) that you purchase 100/300 limits of bodily injury liability. On the other hand, if your personal assets don't amount to much (you don't own a home, struggle from paycheck to paycheck, violins are wailing), you don't have a whole lot for them to bother about, so the minimum requirements might actually suit you, not to mention save you some much-needed cash.

Besides bodily injury liability, personal injury protection, property damage liability and uninsured/underinsured motorist coverage, you have collision and comprehensive auto insurance coverage to consider. Collision covers damage to the policyholder's car resulting from running into anything, be it another car, a fire hydrant, a light post, whatever. Comprehensive coverage takes care of your car in the case of theft, fire, falling objects, missiles, explosion, earthquake, flood, riot and civil commotion, among other things (like what? Alien invasion, we guess).

Comprehensive and collision coverage are required on most lease contracts, and are essential if you own an expensive car. If you're driving an old POS, on the other hand, and the cost of the sum of your premium and your deductible nearly or in fact exceed the worth of your vehicle, you might want to consider doing without this coverage.