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The Los Angeles County Metropolitan Transportation Authority (Metro) has advanced from Phase I to Phase II analysis four unsolicited proposals for the Measure M projects involving the West Santa Ana Branch Transit Corridor and the Sepulveda Pass Transit Corridor P3s. 

The two proposals for the West Santa Ana Branch Transit Corridor moving forward in the process are from Skanska (Skanska USA Civil West) and Kiewit (Kiewit Infrastructure West Co.). Two others are for the Sepulveda Pass Transit Corridor. They are from Parsons (Parsons Transportation Group, Inc.) and Cintra (Cintra US Services LLC, an affiliate of Cintra Global Ltd.).

The review team recommended that Metro decline further review of two proposals: one for the West Santa Ana project from ACS/Dragados (ACS Infrastructure Development, Inc./Dragados USA. Inc.) and one for the Sepulveda Pass project from Sepulveda Corridor Development Partners, led by HDR Engineering, Inc.

The West Santa Ana Rail P3 project comprises a new transit system connecting southeast Los Angeles County to downtown Los Angeles via the abandoned Pacific Electric Right-of-Way/West Santa Ana Branch Corridor (PEROW/WSAB), and a combination of local streets and private and Metro owned rail ROW. The study area stretches approximately 12-miles from Union Station to the PEROW/WSAB in the City of Paramount and 8-miles south along the PEROW/WSAB to the City of Artesia. The project cost is estimated at US$ 4 billion.

The Sepulveda Pass provides a crucial transportation link across the Santa Monica Mountains between the heavy concentration of households in the San Fernando Valley and major employment and activity centers in Los Angeles County's Westside sub-region.

The 405 Freeway is ranked as one of the most traveled urban highways in the nation by the Federal Highway Administration with an Average Annual Daily Traffic of 374,000 vehicles in 2010. The 13-mile stretch of the freeway, from Getty Center Drive, the core of the Sepulveda Pass, to the I-105, was recently ranked as the third most congested freeway segment in the United States. In addition, the US-101 and I-10 interchanges with the I-405 north and south of the Pass consistently rank among the five most congested freeway nterchanges in the country. The project investment is estimated at US$ 1.6 billion.