In third-party car accident claims where fault is in dispute, lengthy investigations can be the norm. Insurance adjusters will investigate the claim thoroughly, often hiring outside parties to conduct interviews, take statement and review any and all records (medical or otherwise) pertaining to the case. You may even need to attend an independent medical examination. The adjuster will then make his or her own determination as to fault and the settlement value of the case.
Actual cash value equals the purchase price of your car minus depreciation and your deductible. So comprehensive coverage will pay an amount up to the actual cash value of your car to either repair or (in the case of a total loss) replace it. If the cost of repairs exceeds your car's ACV, your car insurance company will declare it a total loss and pay the sum of the car's ACV to help you replace it — unless you opt to retain salvage (i.e., keep the totaled car), in which case the salvage value will also be deducted from your payout.
If you have paid off your car, comprehensive coverage is optional. It may be a good idea to find out the Kelley Blue Book value of your vehicle. Would you be able to pay that amount to repair or replace your vehicle if it were stolen or damaged in an accident? If you can't afford to pay much out of pocket, then buying optional coverages, like comprehensive coverage and collision coverage, may be a smart investment.