The Mare Island Causeway Bridge is photographed from Railroad Avenue on Mare Island in Vallejo on March 15, 2022. (Ray Saint Germain/Bay City News)

Long-awaited upgrades to the Mare Island Causeway Bridge are set to begin this summer, bringing improved infrastructure and enhanced safety to commuters, city officials announced Thursday. 

Preliminary off-site preparations will begin July 17 and are not expected to impact traffic. However, starting Aug. 4, traffic will be reduced to one lane as on-site construction gets underway, officials said. 

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