 They underestimated traffic volumes; they also did not take into account that "the amount and weight of trucks [on] today's roadways are significantly higher".He noted, "30 or 40 years ago, engineers could not anticipate the traffic some of their bridges would be forced to accommodate in the coming decades".The design of the overpass was considered innovative at the time; however, this design made it nearly impossible to inspect thoroughly, as the entire deck would have had to be removed for such an inspection.