The negligent party (or their insurance company) must ensure that the damage is repaired or that you are paid the fair value of the property WHICHEVER IS LESS. Meaning, your vehicle will be repaired where damaged in the collision or you will receive its fair market value at the time of the collision.
If other items were damaged or destroyed in the accident, you will have legal claim for those items as well. So, if you had a bike on the back of your car or skis on the top of your car and those things were harmed, a personal injury attorney will fight to get compensation for those belongings, too.