National Highway 4 (Cambodia)

National Highway 4
National Highway 4 in Chbar Mon in Phnom Penh.
Route information
Part of AH11
Location
Country	Cambodia
Highway system
Transport in Cambodia

National Highway 4 or National Road No.4 (10004) (in Khmer ផ្លូវជាតិលេខ ៤) is one of the national highways of Cambodia. With a length of 230 km (140 mi),^[1] it connects the capital of Phnom Penh with Sihanoukville in the south-west.^[2] Sihanoukville is the only international sea port of Cambodia, making NH4 one of the country's most important highways. The road was built in the 1950s, coinciding with the construction of the port.^[1]

The road was built especially for the transport of goods between the capital and the port, by heavy trucks and containers. Portions of NH4 were considered toll roads, with three stations to collect fees. All toll stations have now been removed, the entire road is now toll free.^[3] It is also considered the most dangerous road in Cambodia due to the occurrence of several traffic accidents and limited management by authorities.^[4] Furthermore, the road is congested and in need of maintenance.^[5]