Hanoi, March 7 -- Traffic police will conduct field trips using double-decker sleeper buses on several mountainous highways in northern Vietnam to assess road safety conditions and infrastructure suitability for the large passenger vehicles. The survey, organised by the Traffic Police Department under the Ministry of Public Security, will involve coordination with the Department for Roads of Vietnam and the Vietnam Register under the Ministry of Construction, along with construction departments and police forces in Hanoi, and Phu Tho, Son La, Dien Bien, Lai Chau and Lao Cai provinces. Authorities will examine whether road infrastructure can safely accommodate double-decker sleeper buses, focusing on factors such as curve radius, road widt...