Task: Question Answering
Input (English): Passage: The vast majority of workers in Ratanakiri are employed in agriculture.  Most of the indigenous residents of Ratanakiri are subsistence farmers, practicing slash and burn shifting cultivation. (See Culture below for more information on traditional subsistence practices.) Many families are beginning to shift production to cash crops such as cashews, mangoes, and tobacco, a trend that has accelerated in recent years. Ratanakiri villagers have traditionally had little contact with the cash economy. Barter exchange remains widespread, and Khmer Loeu villagers tended to visit markets only once per year until quite recently. As of 2005, monetary income in the province averaged US$5 per month per person; purchased possessions such as motorcycles, televisions, and karaoke sets have become extremely desirable.Larger-scale agriculture occurs on rubber and cashew plantations. Other economic activities in the province include gem mining and commercial logging. The most abundant gem in Ratanakiri is blue zircon. Small quantities of amethyst, peridot, and black opal are also produced. Gems are generally mined using traditional methods, with individuals digging holes and tunnels and manually removing the gems; recently, however, commercial mining operations have been moving into the province. Logging, particularly illegal logging, has been a problem both for environmental reasons and because of land alienation. This illegal logging has been undertaken by the Cambodian military and by Vietnamese loggers. In 1997, an estimated 300,000 cubic meters of logs were exported illegally from Ratanakiri to Vietnam, compared to a legal limit of 36,000 cubic meters. John Dennis, a researcher for the Asian Development Bank, described the logging in Ratanakiri as a "human rights emergency".
Ratanakiri's tourist industry has rapidly expanded in recent years: visits to the province increased from 6,000 in 2002 to 105,000 in 2008 and 118,000 in 2011. The region's tourism development strategy focuses on encouraging ecotourism. Increasing tourism in Ratanakiri has been problematic because local communities receive very little income from tourism and because guides sometimes bring tourists to villages without residents' consent, disrupting traditional ways of life. A few initiatives have sought to address these issues: a provincial tourism steering committee aims to ensure that tourism is non-destructive, and some programs provide English and tourism skills to indigenous people.Ox-cart and motorcycle are common means of transportation in Ratanakiri. The provincial road system is better than in some parts of the country, but remains in somewhat bad condition. National Road 78 between Banlung and the Vietnam border was built between 2007 and 2010; the road was expected to increase trade between Cambodia and Vietnam. There is a small airport in Banlung, but commercial flights to Ratanakiri have long been discontinued. 
Question: What road was expected to increase trade between Cambodia and Vietnam?
Output (English): National Road 78.