Traffic on eastbound Interstate 80 enters the Carquinez Bridge in Crockett on Saturday, June 27, 2020. Traffic on eastbound Interstate 80 enters the Carquinez Bridge in Crockett on Saturday, June 27, 2020. Hundreds of thousands of vehicles cross the Carquinez Bridge each day, making it one of the Bay Area’s key traffic connectors. The Carquinez Bridge is made up of two separate bridges: a cantilever bridge carrying traffic north to Vallejo on eastbound I-80 and the suspension bridge going south to Crockett (westbound I-80), known as the Alfred Zampa Memorial Bridge. Why are there two separate Carquinez Bridge closures planned — and why can’t they just be done at night?