“Does it make sense to put sprinklers along the underside of some freeways’ elevated decks?”
Passing a law prohibiting tankers from crashing and burning would probably be as effective.
"Witnesses reported flames rising up to 200 feet into the air. Heat exceeded 2,750 degrees and caused the steel beams holding up the interchange from eastbound I-80 to eastbound Interstate 580 above to buckle and bolts holding the structure together to melt, leading to the collapse, California Department of Transportation director Will Kempton said."
Three nice images...