My car is totaled by another driver

Under the law in Maryland, the insurance company only has to pay you the fair market value of your vehicle if it is a total loss.  You can try to provide documentation (e.g advertisements in the newspaper or on the internet as to comparable vehicles being sold, internet sites that list the value of comparable vehicles, receipts showing recent work done on the vehicle other than normal maintenance work) as to why you feel the vehicle has a higher value.  You could also negotiate with the insurance company to get some money but at the same time keep your vehicle (which is called retaining the salvage) and then repair the vehicle so that you cold continue to drive it on the road.  Good luck with this matter.