What is the purpose of weekly car insurance?

Weekly car insurance protects drivers and vehicles for a short period of time, according to CarsDirect. Instances in which weekly car insurance would be applicable include the temporary use of a vehicle, such as car rentals or borrowing someone else's vehicle.

Short-term insurance can be used for vehicle coverage for one day to a full month, according to About.com. Policies cover the same insurances as long-term policies, including liability, collision and bodily injury.

Temporary insurance may not be available through all insurance companies or in all states. The cost of paying for insurance only when needed and on a short-term basis is typically higher than traditional long-term insurance.