Transport in Bahrain encompasses road transport by car, air transport and shipping. It has been announced that a monorail network will be constructed.Bahrain has one of the lowest gasoline prices in the world, at $0.78 per gallon ($0.21 per liter).The widening of roads in the old districts of Manama and the development of a national network linking the capital to other settlements commenced as early as the arrival of the first car in 1914.The continuous increase in the number of cars from 395 in 1944 to 3,379 in 1954 and to 18,372 cars in 1970 caused urban development to primarily focus on expanding the road network, widening carriageways and the establishment of more parking spaces. Many tracks previously laid in the pre-oil era (prior to the 1930s) were resurfaced and widened, turning them into 'road arteries'. Initial widening of the roads started in the Manama Souq district, widening its main roads by demolishing encroaching houses.A series of ring roads were constructed (Isa al Kabeer avenue in the 1930s, Exhibition avenue in the 1960s and Al Fateh highway in the 1980s), to push back the coastline and extend the city area in belt-like forms. To the north, the foreshore used to be around Government Avenue in the 1920s but it shifted to a new road, King Faisal Road, in the early 1930s which became the coastal road.To the east, a bridge connected Manama to Muharraq since 1929, a new causeway was built in 1941 which replaced the old wooden bridge. Transits between the two islands peaked after the construction of the Bahrain International Airport in 1932.