NTSB

Elaine Thompson / AP Photo

A series of mistakes led a truck to strike an overhead girder of the Interstate 5 bridge, causing it to collapse into the Skagit River last year, the National Transportation Safety Board said in an exhaustive list of safety recommendations released Tuesday.

NTSB

Federal safety investigators so far have been unable to pinpoint the root cause of a 787 Dreamliner battery fire. At the same time, the Federal Aviation Administration is weighing whether to let Boeing move ahead with tests of a new battery design. Does the FAA have to wait for the safety investigation to finish? The short answer is, no.