You don't need to watch the entire 4 minute video. The first 50 Seconds or so would be enough.
Here is the transcript:
Steve Kroft: According to the government, there are 70,000 bridges that have been deemed structurally deficient.
Ray LaHood: Yep.
Steve Kroft: What does that mean?
Ray LaHood: It means that there are bridges that need to be really either replaced or repaired in a very dramatic way.
Steve Kroft: They're dangerous?
Ray LaHood: I don't want to say they're unsafe. But they're dangerous. I would agree with that.
What is the definition of Unsafe? Let's ask Google: