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If you cause an accident, collision coverage will pay to repair your vehicle. You usually can't collect any more than the actual cash value of your car, which is not the same as the car's replacement cost. Collision coverage is normally the most expensive component of auto insurance. By choosing a higher deductible, say $500 or $1,000, you can keep your premium costs down. However, keep in mind that you must pay the amount of your deductible before the insurance company kicks in any money after an accident.

Insurance companies often will "total" your car if the repair costs exceed a certain percentage of the car's worth. The critical damage point varies from company to company, from 55 percent to 90 percent.

Comprehensive coverage will pay for damages to your car that weren't caused by an auto accident: Damages from theft, fire, vandalism, natural disasters, or hitting a deer all qualify. Comprehensive coverage also comes with a deductible and your insurer will only pay as much as the car was worth when it got wrecked.

Medical payments (MedPay) coverage will pay for your and your passengers' medical expenses after an accident. These expenses can arise from accidents while you're driving your car, someone else's car (with their permission), and injuries you or your family members incur when you're pedestrians.

The coverage will pay regardless of who is at fault, but if someone else is liable, your insurer may seek to recoup the expenses from him or her.

Personal injury protection (PIP) and broader "no-fault" coverages are expanded forms of medical payments protection that may be required in your state. Some states have optional PIP or no-fault coverage. Expanded features include payments for lost wages and child care.

If you have a good health insurance plan, there might be little need to buy more than the minimum required PIP or MedPay coverages, if at all. And, if you already have disability insurance, there's little reason to purchase higher-than-minimum amounts of PIP.