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1.
When one truck attempts to pass another on the highway, but lacks the power to pass. Ultimately the two trucks remain side by side holding up everyone behind them for miles because nether one of them wants to lose the race.
"Oh great!! now we're stuck behind an elephant race"
by tomgun007 October 04, 2013
 
2.
When two semi trucks are side-by-side on a two lane road and neither is going faster than the other.
I would have been here sooner but I was caught in traffic behind an elephant race.
by Iocane July 06, 2014