A car, lower right, and what is believed to be a travel trailer lie in the Skagit River with debris from the collapsed portion of the Interstate 5 bridge Friday in Mount Vernon, Wash. A truck carrying an oversize load struck the four-lane bridge on the major thoroughfare between Seattle and Canada, sending a section of the span and two vehicles into the Skagit River below Thursday evening. All three occupants suffered only minor injuries. At an overnight news conference, Washington State Patrol Chief John Batiste blamed the collapse on a tractor-trailer carrying a tall load that hit an upper part of the span. Story here. (AP Photo/Elaine Thompson)

Question: How safe do you consider our nation's bridges?