The California Highway Patrol shut down both sides of Interstate 805 after a gas leak in Chula Vista Monday.
The CHP started reopening all lanes around 5:45 p.m. The freeway had been closed from State Route 54 to State Route 905.
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The break happened around 2:45 p.m. at East Palomar Street and Nacion Avenue. Fire officials told NBC 7, a Caltrans worker broke an 8-inch natural gas line with a back hoe.
Crews shut off the gas around 5 p.m., and residents were allowed to return home. People living in a half-mile radius of the break site and students and staff at Palomar Elementary School had been evacuated as a precaution.
SANDAG made State Route 125 toll-free Monday night to help alleviate traffic. The traffic jam could impact Monday night's Mumford and Sons concert at the Sleep Train Amphitheater.
Check back for updates on this developing story.