Line 3 Scarborough is a planned extension of the Toronto Transit Commission (TTC) subway system in Toronto, Canada. It aims to connect the existing Scarborough Line 2 to the Scarborough Town Centre and other key areas, improving public transit access for residents. The project includes several new stations, enhancing transportation options for the growing population in Scarborough. It is part of a broader effort to modernize and expand the TTC network, making it more efficient and accessible for commuters in the region.