An engineering explanation and analysis of the Florida bridge collapse, with video of it happening, that killed 7 and wounded a dozen others... by an engineer, at great length. Skip forward constantly to get the gist of it

dash cam footage of the collapse at 1:42 to 1:55

thank you Bill! This truly is a damn good and thorough explanation from an engineer with the specific drawing from the bridge planning dept and the dash can video, and video from the build engineers