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Message: <blockquote data-quote="justanotherpatriot" data-source="post: 1827317" data-attributes="member: 24587"><p>I agree that they aren't fun to drive but you should be thankful they are that way.  The arc in the spans are called camber which put simply means it has a preloaded stress/arc above plane.  If there were to be a traffic jam and the bridges were backed up, the spans are engineered to handle the weight of all those cars.  At that load rate the span should be almost flat with no discernable arc when fully loaded.  If they started out with no/light load at no discernable arc, when capacity was reached it would result in a bow (arc below plane) which would certainly result in catastrophic failure.</p></blockquote><p></p>