STEVENSVILLE, Md. (WJZ) — A fire on the Chesapeake Bay Bridge creates a traffic nightmare for commuters.

A thick cloud of black smoke was first reported around 6 p.m. Sunday coming from the highest point of the bridge.

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Authorities believe a construction area under the westbound span caught fire.

Traffic in that direction was completely shut down for several hours, causing major delays.

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One lane on the eastbound span of the bridge was also closed.

Investigators are still trying to figure out exactly what caused the fire.

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Stay with WJZ and CBSBaltimore.com for the latest on this developing story.