The liability insurance that gives coverage against the damages you cause to third party. It will also add medical expenses. The liability insurance gives the limits of the policy and incase you are driving a rental car at that time your personal auto liability insurance give you comprehensive and collision coverage.
The Loss damage waivers (LDW) and collision damage waivers (CDW) both are essential insurance for the comprehensive coverage of rental car. The car rental company always insists on both The Loss damage waivers (LDW) and collision damage waivers (CDW). It is noted that some LDWs include the CDW, and some waivers need to pay a deductible.
Incase you do not have the insurance coverage of collision and comprehensive insurance in such case it is ideal to take the Loss damage waivers (LDW) or collision damage waivers (CDW), normally offers by the rental company offers. It is essential to get the more coverage to protect yourself as well as rental car. The Rental companies have normally give different level of damage waivers. If your coverage is broader you are more secure and you are also going to pay more.
Some rental car company gives accidental death and personal property benefits that will give you "double coverage" to the renter. You can also get the rental coverage through the credit card, you must have assure that the coverage applicable to some days only and have a limitations.