This week's biggest headlines in transportation:

Breaking news: LA Metro Board approves underground rail line option through the Sepulveda Pass linking Van Nuys, UCLA, and Westside

• Multibillion-dollar transit project to tunnel through the Santa Monica Mountains is approved by L.A. Metro
• LA Metro Advances Underground Heavy Rail Project
• L.A. Metro Board approves new underground rail line through Sepulveda Pass
• Transit through the Sepulveda Pass is the first step in redesigning L.A.’s future
• High-speed Metro project promising 20-minute commute between the Valley and Westside moves forward
• LA Metro picks preferred alternative for Sepulveda Corridor transit-rail project
• SUPERVISOR HORVATH AND METRO BOARD ADVANCE DECADES-IN-THE-MAKING SEPULVEDA TRANSIT CORRIDOR PROJECT
• Daily Bruin: LA Metro approves Sepulveda Pass high-speed rail plan with UCLA stop
• OpEd: Sepulveda Corridor Can Transform L.A.
• California surpasses goal of having 1.5M zero-emission vehicles on the road by 2025
• What L.A. Transportation Agencies Can Learn from the Successful Metro Ambassador Program
• Study: L.A. Metro riders feel safer with Ambassador program