operated between Phnom Penh and Battambang but a US$141 million project, funded mostly by the Asian Development Bank, has been started to revitalise the languishing rail system that will "(interlink) Cambodia with major industrial and logistics centers in Bangkok and Ho Chi Minh City". Besides the main inter-provincial traffic artery connecting Phnom Penh with Sihanoukville, resurfacing a former dirt road with concrete/asphalt and bridging five major river crossings have now permanently connected Phnom Penh with Koh Kong, and hence there is now uninterrupted road access to neighbouring Thailand and its road network. Cambodia's road traffic accident rate is high by world standards. In 2004, the number of road fatalities per 10,000 vehicles was ten times higher in Cambodia than in the developed world, and the number of road deaths had doubled in the preceding three years. Cambodia's extensive inland waterways were important historically in international trade. The Mekong and the Tonle Sap River, their numerous tributaries, and the Tonle Sap provided avenues of considerable length, including navigable all year by craft drawing and another navigable to craft drawing . Cambodia has two major ports, Phnom Penh and Sihanoukville, and five minor ones. Phnom Penh, at the junction of the Bassac, the Mekong, and the Tonle Sap Rivers, is the only river port capable of receiving 8,000-ton ships during the wet season and 5,000-ton ships during the dry season. With increasing economic activity has come an increase in automobile use, though motorcycles still predominate. "Cyclo" (as hand-me-down French) or Cycle rickshaws were popular in 1990s but are increasingly replaced by remorques (carriages attached to motorcycles) and rickshaws imported from India. Cyclos are unique to Cambodia in that the cyclist sits behind the passenger seat. Cambodia has three commercial airports. In 2018, they handled a record of 10 million passengers. Phnom Penh International Airport is the busiest airport in Cambodia. Siem Reap-Angkor International Airport is the second busiest, and serves the most international flights in and out of Cambodia. Sihanouk International Airport, is in the coastal city of Sihanoukville. Science and technology A National Committee for Science and Technology representing 11 ministries has been in place since 1999. Although seven ministries are responsible for the country's 33 public universities, the majority of these institutions come under the umbrella of the Ministry of Education, Youth and Sports. In 2010, the Ministry of Education, Youth and Sports approved a Policy on Research Development in