National Highway 4 or National Road No.4 (10004) (in Khmer

Khmer language

Khmer , or Cambodian, is the language of the Khmer people and the official language of Cambodia. It is the second most widely spoken Austroasiatic language , with speakers in the tens of millions. Khmer has been considerably influenced by Sanskrit and Pali, especially in the royal and religious...

 ផ្លូវជាតិលេខ ៤) is one of the national highways of Cambodia

Cambodia

Cambodia , officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia...

. With a length of 230 km (142.9 mi), it connects the capital of Phnom Penh

Phnom Penh

Phnom Penh is the capital and largest city of Cambodia. Located on the banks of the Mekong River, Phnom Penh has been the national capital since the French colonized Cambodia, and has grown to become the nation's center of economic and industrial activities, as well as the center of security,...

 with Sihanoukville

Sihanoukville

Sihanoukville , also known as Kampong Saom, is a province in southern Cambodia on the Gulf of Thailand. This port city is a growing Cambodian urban center, located southwest of the Cambodian capital, Phnom Penh. The province is named after King Father Norodom Sihanouk and grew up around the...

 in the south-west. Sihanoukville is the only sea international port of Cambodia. In consequence, NH4 is one of the most important highways of the country for economical purposes. The road was built in the 1950s along with the construction of the port.

The road has been built especially for the transport of merchandise between the capital and the port by heavy trucks and containers. It has three toll stations

Toll road

A toll road is a privately or publicly built road for which a driver pays a toll for use. Structures for which tolls are charged include toll bridges and toll tunnels. Non-toll roads are financed using other sources of revenue, most typically fuel tax or general tax funds...

 along. However, it is considered the most dangerous road of Cambodia due to several traffic accidents and little control by authorities.

Description

The road begins at the junction of Pochentong Avenue and the National Highway 3

National Highway 3 (Cambodia)

National Highway 3 or National Road No.3 is one of the national highways of Cambodia. With a length of , it connects the capital of Phnom Penh with Veal Rinh. The road underwent significant refurbishment in 2008 and forms part of an international "North-South economic corridor" from Kunming in...

. The junction is at the west of Phnom Penh

Phnom Penh

Phnom Penh is the capital and largest city of Cambodia. Located on the banks of the Mekong River, Phnom Penh has been the national capital since the French colonized Cambodia, and has grown to become the nation's center of economic and industrial activities, as well as the center of security,...

, just near the Phnom Penh International Airport

Phnom Penh International Airport

-Statistics:-International terminal profile:*Total capacity: 2 million passengers**Surface: **Waiting lounges: **VIP Lounge: **Food & Beverage: **Duty Free: *Seat capacity: 360*Check-in counters: 22*Visa, Immigration and Customs counters: 30...

, in the Sangkat Chaom Chau - Dangkor District. The road goes to the right hand toward the west and after the south west.

After the first toll road, it enters the Kandal Province

Kandal Province

Kandal is a province of Cambodia. Its capital is Ta Khmao town . The province completely surrounds, but does not include, the national capital Phnom Penh...

. It crosses Kampong Speu, Koh Kong

Koh Kong Province

Koh Kong is a province of Cambodia. The name means "Kŏng Island Province". Its capital is Koh Kong.-Geography:The most south-western province of Cambodia, Koh Kong has a long undeveloped coastline and a mountainous, forested and largely inaccessible interior which embraces part of the Cardamom...

 and Sihanoukville

Sihanoukville

Sihanoukville , also known as Kampong Saom, is a province in southern Cambodia on the Gulf of Thailand. This port city is a growing Cambodian urban center, located southwest of the Cambodian capital, Phnom Penh. The province is named after King Father Norodom Sihanouk and grew up around the...

 provinces. In the territory of Koh Kong, at Chamkar Luong, starts the National Road 48 to Koh Kong town at the west and the Thailand

Thailand

Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

 border. In the territory of Sihanoukville, at Prey Nob District, it starts the NH3 to Kompot

Kompot

thumb|Dried plum kompotthumb|Apple and quince kompotKompot is a traditional drink in Central and Eastern European countries. It is a light, refreshing drink most often made of dried or fresh fruit boiled in water with sugar and left to cool and infuse...

 to the east and the Vietnam

Vietnam

Vietnam – sometimes spelled Viet Nam , officially the Socialist Republic of Vietnam – is the easternmost country on the Indochina Peninsula in Southeast Asia. It is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, and the South China Sea –...

ese border.

Important places along the road

Kirirom National Park

Kirirom National Park

Kirirom National Park is a national park in Cambodia. It is located mostly in Phnom Sruoch District, Kampong Speu Province, while a smaller section is in neighboring Koh Kong Province.-Legend:...

 is located along the highway as is the town of Sre Ambel

Sre Ambel

Sre Ambel is a town in Koh Kong Province in south-western Cambodia. It is located along National Highway 4 and is 138 kilometres from Koh Kong ....

.