Cambodia’s transport infrastructure and logistics services have evolved following post-conflict rehabilitation and expansion. The corridor linking Phnom Penh to Sihanoukville port is the main national trade route, while that linking Bangkok-Phnom Penh-Ho Chi Minh City is the main international corridor. Major national roads and international highways connecting Cambodia to neighbouring countries may be in good shape, but roads linking rural areas to major cities and urban transport systems are not less developed. The railway system is a weak link in Cambodia’s regional connectivity. Port efficiency has improved, but shipping costs remain high.
(Source: Cambodia Development Research Institute - 2016 Cambodia Outlook Conference Brief)