so the mystery on johnsburg road continues.'ll be right back. by a regist. ♪ for a standard of care ♪ that raises the bar ♪ call 844-4-brightstar >> after seeing all the twists in tonight's mystery, we want to know what you think at home. use the #abc2020. i'm david muir. >> and i'm elizabeth vargas. for all of us here at abc news and "20/20," thanks for watching, and enjoy the rest of your weekend. goodnight. [ beeping ] man: 421 410 e-tech number one. fire and police, there's a bridge collapse. woman: apparently this bridge went down. we're going to be starting a couple other trucks. babineau: the 35w bridge, it's eight lanes of constant traffic all day long. man: we're going to need rescue all up and down the bridge on both sides. ward: it was unconceivable that a bridge would just collapse. bridges aren't supposed to fall down. breaking news right now -- we've just heard about a bridge collapse. walz: i heard a snap. karge: my car did a 70-foot nosedive. schueller: all i saw was a cloud of dust. man: the entire bridge is in