Explosion seems to come from truck once it's on the other side of the bridge. Also I would think a gas line would keep burning persistently until turned off.
check the upper left of the bridge in the video you can see the pipe flaring and not dying down.
Yea, that could be a gas line. I was thinking that was the garbage truck on the other side of the bridge still burning.
No one is stupid enough to run a gas line underneath that bridge. The explosion is most likely from the trucks fuel source which is compressed natural gas.
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