Many manufacturers are heavily investing for near future production and marketing of alternative fuel vehicles.  These include electric vehicles, hybrids, fuel cells, hydrogen compressed and liquid natural gas, liquid propane, and hydrogen.  As these vehicles are deployed in the fleet, their safety during refueling, recharging, and in crashes, become issues of paramount concern.  Ensuring that alternative fuel vehicles attain a level of safety comparable to that of other vehicles requires extensive research, due to the many advanced and unique technologies that have previously not been tested in the transportation environment.  A failure to adequately address safety concerns in the earliest stages of development could affect the future development of these promising technologies.