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There is a roundabout called Choam Chao, 12 km from the city center or 2 km from the airport entrance. This is where the national roads NH3 and NH4 start, one to Kampot and one to Sihanoukville. This makes a good hitchhiking spot. A tuk-tuk from the train station will be between 2 US$ and 6 US$, depending on the time and how good you haggle. A public [https://www.google.com/search?q=openstreetmap+relation+line+03&ie=utf-8&oe=utf-8#q=openstreetmap+relation+line+03+Chom+Chav+Roundabout Public bus number 3] goes to the roundabout beginning at the Night Market.