The line originally opened to provide access from the centre for the new residential areas in the eastern part of city, along the right bank of the Neva River. However, delays in the construction of the future Frunzensko-Primorskaya Line (Line 5), compelled the metro officials to temporarily link the already completed northern part of the Line 5 (starting from Sadovaya) to Pravoberezhnaya Line, as they felt that it was better to have a single connected line rather than two unconnected ones. From that point on, the line expanded northward, as per original plans of Line 5 expansion.