Motorists traveling through the interchange of the Orange (57) and Pomona (60) freeways in Diamond Bar will face a series of weekend closures this month as construction continues on a major traffic improvement project, officials announced Tuesday.
The San Gabriel Valley Council of Governments said the closures are part of the SR-57/60 Confluence Project, which aims to improve safety and traffic flow at the busy interchange.
According to the American Transportation Research Institute, the roughly two-mile stretch is the worst truck bottleneck in California and the seventh worst in the nation, carrying about 350,000 vehicles daily.
The first closure is scheduled from midnight Saturday until 8 a.m. Sunday, when the eastbound 60 Freeway will be closed between Lemon Avenue and Diamond Bar Boulevard.
Additional closures are planned from midnight Saturday, March 21, until 8 a.m. Sunday, March 22 and again from midnight Saturday, March 28, until 8 a.m. Sunday, March 29, when the westbound 60 Freeway will be closed along the same stretch.
Officials said several ramps and connectors in the area will also be closed during construction, including the Grand Avenue bridge over the freeway. Signed detours will be in place, and motorists are encouraged to use alternate routes and allow extra travel time.
The SR-57/60 Confluence Project is being led by the San Gabriel Valley Council of Governments in partnership with Los Angeles Metro and Caltrans.