In case of a severe accident, make sure that you and your co-passengers are safe, and attend to any medical needs. Don’t try to restart the car, and let the towing service take care of that. If you have roadside assistance, use it. Call your insurance provider, and inform them, and then file an FIR at the nearest police station. Then later, you need to fill the claim form with copies of your FIR, Registration, and driving license.