 Project highlights in this segment include the multibillion-dollar Doha Expressway and the Qatar Bahrain Causeway, which will connect Qatar to Bahrain and Saudi Arabia and is considered a milestone in regional interconnectivity.Mass-transit options, such as a Doha metro, light-rail system and more extensive bus networks, are also under development to ease road congestion.In addition, the railway system is being significantly expanded and could eventually form an integral part of a GCC-wide network linking all the Arab states of the Persian Gulf.