The Bourne and Sagamore bridges on the Cape and the Tobin Bridge are on the NTSB list as part of the ongoing investigation into the collapse of the Francis Scott Key Bridge in Baltimore.

State officials are considering replacing the 74-year-old Tobin Bridge with a tunnel, prompting mixed reactions from Boston and Chelsea residents. Iris Arroyo said she won't drive over the bridge.

That group also includes Boston’s Tobin Bridge and the Sagamore and Bourne bridges on Cape Cod. The NTSB said its report “does not suggest that the 68 bridges are certain to collapse,” however.