From City of Hayward press release:

Construction of The Loop, from March 15 to March 18, is the final piece of the biggest public works project in Hayward's history.

The switch to single-direction traffic is designed to improve traffic flow downtown while relieving congestion and providing easier access to Hayward's downtown.

The work will cause major traffic disruptions from the evening of March 15 until before the morning rush hour of March 18.

The Loop changes the flow of traffic in the critical Five Flags area from Jackson Street and Mission Blvd up to A Street and Foothill Blvd. It is part of the Route 238 Corridor Improvement Projet, paid for primarily with Alameda County Measure B funds, the half-cent transportation sales tax passed by voters.

More information about The Loop, the construction schedule, or the Route 238 Corridor Improvement Project is available at www.HaywardLoop.org