The Purple Line Extension, formerly known as the Westside Subway Extension and the Subway to the Sea, is a new heavy-rail subway corridor in Los Angeles County, California, extending the D Line (Purple Line) from its current terminus at Wilshire/Western in Koreatown, Los Angeles, to the Westside region. Currently under construction, the corridor will become part of the Los Angeles Metro Rail system. The project is being supervised by Los Angeles County Metropolitan Transportation Authority (Metro). The subway has been given high priority by Metro in its long-range plans, and funding for the project was included in two county sales tax measures, Measure R and Measure M.