Armenia has a reliable and affordable public transport system. In addition to rental cars, taxis, buses, trolleybuses, vans (referred to as marshrutkas), and train, it also has an underground metro system with 10 stations. The most popular types of public transport in Yerevan are buses and minibuses. The alternative type of public transportation in Yerevan is taxi. Roads provide access to employment, markets, education, and health services, and thus are crucial for economic development. Since 1990, road networks have expanded in all developing countries in Asia except Armenia, Georgia, Kazakhstan, Azerbaijan, and Tajikistan. China and India account for almost two-thirds of the roads in Asia. Armenia has slightly less than 8,000 kilometers of roads, 94 percent of which are paved; however, some of the paved roads need major rehabilitation. The number of vehicles has surged in developing Asian countries. In 1990, only 2 countries recorded 100 or more motor vehicles per 1,000 people. In 2010, 19 countries had more than 100 vehicles per 1,000 people. Armenia has 92 registered vehicles per 1,000 people. In comparison, Azerbaijan has 110 and Georgia has 170 per 1,000 people. In developed countries, this number is typically more than 700.