A new express lane on southbound Interstate 680 opened to traffic Friday along 9 miles between Alameda and Contra Costa counties.

The new express lane runs from Alcosta Boulevard south to state Highway 84, and won’t have tolls charged until more work on the project is completed later this year, according to the Alameda County Transportation Commission, which serves as the county’s traffic congestion management agency.

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Dan McMenamin is the managing editor at Bay City News, directing daily news coverage of the 12-county greater Bay Area. He has worked for BCN since 2008 and has been managing editor since 2014 after previously serving as BCN’s San Francisco bureau reporter. A UC Davis graduate, he came to BCN after working for a newspaper and nonprofit in the Davis area. He handles staffing, including coaching of our interns, day-to-day coverage decisions and management of the newswire.