A weekend-long road closure is underway in San Francisco as Caltrans begins the second phase of a rehabilitation project on 19th Avenue. Crews started work early Friday morning on the major roadway, which serves as a key artery through the city. This phase focuses on the southbound direction. Two of the three southbound lanes between Lincoln Way and Sloat Boulevard are closed. Earlier this month, Caltrans work centered on the northbound side. San Francisco Apr 27 Highway 1 (19th Avenue) in San Francisco reopens early after weekend roadwork San Francisco Apr 23 Hwy 1 (19th Avenue) closures in San Francisco: What to know, timeline, detours San Francisco Apr 24 Hwy 1 (19th Avenue) closures in San Francisco for road repairs The timing is also different for this closure. Crews began work at 3 a.m., earlier than the 7 a.m. start during the first phase, which could impact commutes sooner in the day. Drivers are also being advised of additional closures. From 3 a.m. to 7 a.m. through the weekend, Lincoln Way at 19th Avenue will be closed, with detours along Irving Street. This is the second of three planned weekend closures for the project. Another closure is scheduled for Memorial Day weekend. Parking along 19th Avenue will also be restricted in work zones. ...read more read less