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A group of trucks (minimum one per lane) on a limited access highway that are traveling side by side at the same speed or close to it, thereby making it difficult or impossible to pass.

Portmanteau of "truck" and "blockade." The idea originates from the blockades in the game of parchesi. See also Parchesie Block.
I cannot go any faster because of the truckade in my way.
by Bed time May 23, 2010
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