We told you yesterday about a State Highway truck that caught fire after hitting a mattress on I465 in Indianapolis.
That truck was fueled by compressed natural gas.
It is just one of several alternative fuels being used in vehicles that can cause problems emergency responders in an accident situation.
Compared to gasoline, CNG doesn't ignite as quickly, but when it does, it will burn rapidly.
Firefighters are now getting constant updates, special training to deal with ever-changing fuel sources -- including hybrids that can pose a high-voltage risk.
Sometimes fire fighters use the jaws-of-life to cut open cars to extract victims but if you cut through a high voltage line the results could be deadly.
Twenty percent of new buses and trucks are fueled by compressed natural gas.
Fire departments in the U.S. respond to a vehicle fire every 2 and a half minutes.