The San Mateo-Hayward Bridge shuts down the weekend of May 22-25 from 10 p.m. Friday to 5 a.m. Monday. During the closure, Caltrans construction crews resurface and treat the deck, which recorded more than 17 million vehicle crossings during the 2014 fiscal year. Crews also perform routine maintenance on the bridge. Use the Dumbarton Bridge, the Bay Bridge, or Highway 237 in the South Bay as alternatives. Updates are posted at 511.org (source: SMCTA).