How many vehicles and for what use will be manufactured prior to "our" production cars? tens? hundreds? thousands? Used for... Test mules, Crash testers, general production fitment testers, EPA/DOT or other agency testers? And which are used for more than one categories? Like would a vehicle tested by EPA become a crash test? For the sake of simplicity, just considering the United States vehicle agencies, how long does it take to have the vehicle signed off? Weeks? Months? Is it a matter of the manufacturer providing documentation of their testing, or providing vehicle to a test center(s)?