A top transportation official is warning authorities to assess what risk bridges face catastrophic collapse due to collision.
The Anthony Wayne and Martin Luther King Jr. bridges "have an unknown level of risk of collapse" if hit by a ship, the National Transportation and Safety Board says.
Interstate traffic heading into Ohio from West Virginia is closed after an excavator hit part of a bridge Wednesday morning.
Proponents say the bridge would lead to economic growth, but some residents are concerned about losing their homes.
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