 In recommending approval for both proposals, DPWH Secretary Rogelio Singson said they could co-exist as the projects service two different corridors of the metro.The project was first proposed by San Miguel Corporation in November 2017.SMC envisions its project expanding the two-lane section from Hillsborough toll plaza to Alabang to six (three lanes each way), and building a extension from South Station Alabang, the current southern terminus, to SLEX Susana Heights in Muntinlupa.