Testing
Toyota began fuel cell development in Japan in the early 1990s and has developed a series of fuel cell vehicles, subjecting them to more than one million miles (1.6 million km) of road testing. Since 2012, fuel cell test vehicles have logged thousands of miles on North American roads. This includes hot testing in Death Valley, cold testing in Yellowknife, Canada, steep grade hill climbs in San Francisco and high altitude trips in Colorado. The Toyota-designed carbon fiber hydrogen tanks have also undergone extreme testing to ensure their strength and durability in a crash.