Generally, collision insurance covers damage to your automobile caused by collision with another object or by upset. Comprehensive insurance covers damage to your automobile from vandalism, theft or glass breakage. If you are making payments on your vehicle, your lienholder will usually require you carry these coverages. They require these coverages, because they cover the vehicle up to its actual cash value. (And, the vehicle technically belongs to them.) However, if your vehicle is paid for, it is your choice to purchase comprehensive and collision coverages. Now, some insurance companies will not sell comprehensive coverage without the collision coverage. And, some insurance companies will require you keep the deductible amount the same for both coverages. In order to determine if these coverages are worth purchasing, you will need to weigh the value of your vehicle against your deductible amount and the premium you will be paying for the coverages. An older vehicle that does not have much value isn't typically insured for comprehensive and collision coverage.
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