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Two different ways to read that sign, I believe. One day (they don't know which day) the bridge will be closed for one day between Oct. 17 & Oct. 28. Super they let you know with such advance notice.
I really don't want to detract from the enjoyment this thread provides, for most of us, but to specifically answer your question the answer is no. Mercury (Hg) is a liquid at standard pressure & ambient temperature of 25°C.
Hmmm....I can't say I believe it was behind any engine....you ever see a hardened metal driveshaft twist? I'm dubious. Oh well.
The photo shows a truck big enough to have air brakes.
If the air brakes were locked , and some fool put it in low gear, revved it up, and dumped the clutch........
That could easily be the result.