INDOT truck hits mattress, catches fire

...isn't it just common sense its the compressed gas, .

Maybe, maybe not. Gasoline "can" be considered far more dangerous in one way than LP gas because gasoline has a much wider range of A/F of ignition/ combustion, AND gasoline produces more energy per pound than LP which means if a tank explodes, you get a "bigger bang" per size of tank than with LP

Since this here is gaseous NG, not liquified, it might be a little harder to equate into these comparisons. CNG obviously operates at MUCH higher pressure than LP, so I admit that might be a concern.

But if you're so worried, remember that U.S. manufacturers never worried about YOUR safety until dragged kicking and screaming before the Federal Govt.

"We" all remember the Pintoeds with the tank at the rearmost of the car, and worse, if you were in the back seat, your eggshell of a skull was against the rear window!!!! Neighbor of mine is refurbing a 69? Stang, there's a big hole in the trunk floor, until I realized that the FUEL TANK is what FILLS THAT HOLE!!! There is nothing between "it" and "you" but a nice combustible rear seat!!!!

And for years and YEARS some pickups had the fuel tanks right in the cab with ya.

So what's the answer?

I don't know.

Trucks and trains carry tons of hazardous, dangerous, explosive "stuff" around every day, never mind the fuel system