"Il y a trop de camions sur cette route."
Translation:There are too many trucks on this road.
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Saying "trop des camions" would be understood as referring to some specific trucks (following some conversation unknown to us). The term "trop de" + plural noun = too many (plural noun). Compare this with "des" used to express an unknown quantity of something: https://www.thoughtco.com/du-de-la-des-1368977