The westbound span of the bridge was closed for several hours following the crash, as tow operators were working to clear vehicles. All lanes reopened by 2 p.m. ET, the Maryland Transportation Authority said.

Authorities advised people to continue to expect delays in both directions.

Maryland Transportation Authority Police officers are investigating the cause of the crashes.

The bridge's dual spans are four miles long, making them among the longest over-water structures in the world, according to the Maryland Transportation Authority.

Also known as the William Preston Lane Jr. Memorial Bridge, it connects the eastern shore of Maryland with the areas of Annapolis, Baltimore and Washington, D.C.

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