Comprehensive and collision coverage are optional coverages. Lenders frequently require drivers to buy comprehensive and collision coverage as a condition of a car loan agreement. Those driving older cars sometimes drop these coverages as a way of saving money. If a car is worth less than $1,000 or less than 10 times the insurance premium, purchasing the optional coverages may not be cost effective. But bear in mind that you need to purchase both collision and comprehensive coverage in order to fully protect your vehicle from all types of damage.