American Association of State Highway and Transportation Officials
Coverage of American Association of State Highway and Transportation Officials in the Nexus archive.
- Mackinac Bridge falls below threshold of collapse risk from vessel collision, report finds
The Mackinac Bridge is at a lower risk of collapse from vessel collisions than the national threshold, according to a report by the Mackinac Bridge Authority and consultant Parsons. The study, conducted in response to the National Transportation Safety Board's request following the 2024 Baltimore bridge collapse, found the bridge's annual collapse probability is 0.000097, below AASHTO's limit for critical bridges.
- Mackinac Bridge clears national safety check prompted by bridge collapse in Baltimore
The Mackinac Bridge was found to have a lower risk of collapse from ship collisions than national safety thresholds, according to a report by engineering firm Parsons. The study calculated a 10,350-year return period for potential collapse, below the .0001 limit for critical bridges, contrasting sharply with the 2024 Francis Scott Key Bridge collapse in Baltimore.