 It has been speculated that the Maya solved this urban transportation problem by constructing a 100-meter long suspension bridge across the wild river in the late 7th century.The bridge which featured three spans extended from a platform on the grand plaza of Yaxchilan crossing the river to the northern shore.The 63 meter center span remained the longest in the world until the construction of the Italian Trezzo sull'Adda Bridge in 1377.