The MRT-4 is a planned 12.7 km heavy rail line along Ortigas Avenue Extension, connecting Taytay, Rizal to EDSA Ortigas. With 10 proposed stations, Metro Rail Transit Line 4 aims to cut travel time between Rizal and Metro Manila to under an hour. Scheduled for completion by 2031, MRT-4 will ease traffic, improve connectivity, and boost accessibility for commuters and communities along its route.