The D Line Subway Extension is a construction project in Los Angeles County, California, extending the rapid transit D Line of the Los Angeles Metro Rail system from its former terminus at Wilshire/Western in Koreatown, Los Angeles, to the Westside region. The project is being supervised by Los Angeles 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.