INDOT truck hits mattress, catches fire

I'm around CNG every day at work.....we use it on our buses. The tanks are filled up to just under 4000 PSI, then there's a regulator that drops it down to about 110 and that's what the engine breathes in. The tanks are mounted on the roof and there are THICK stainless hard lines that route down to the engine compartment. It's gotten really safe. The tank manufacturer even has videos of them shooting a fully pressurized tank with a gun, over and over and it doesn't blow.

Although we've had some fires on our buses, it's usually not related to the natural gas system.....unless you include the fact that these engines run really hot, compared to diesels. Most of our fires are electrical in nature, or a blown hydraulic line spraying onto a hot turbo. We DID have a bus that ran over a mattress, box spring actually.....dragged it, made tons of sparks and burned that bus to the ground!