If you wish to go to Anlong Veng you best come from Siem Reap via Major Road No 64 (distance: 142km). The time of journey vary depending on the season between 4-6hours. The easiest transport mean is a share taxi, which will charge you around US$4-5. Anlong Veng is also connected by reasonable roads to the provincial capital Samraong (US$4) in the West and Prasat Preah Vihear to the East.
The road to Siem Reap is in good condition, but driving in Cambodia is still challenging in the extreme, and should be attempted only by experienced riders. Speeding taxis, slow cows, and oblivious children are the norm. The trip calls for a dirt or road bike, no smaller than 250cc. It can be made in a day, but two days with a layover in Kampong Thom is a more relaxed alternative and allows time to visit the pre-Angkorian ruins of Sambor Prei Kuk. Leave Phnom Penh via the Japanese Bridge and follow National Highway No 6 75km to the North. You'll reach the Skun intersection (Skun is known for its exotic foods - check out the fried spiders, turtle eggs and more at roadside stands.), where you have to turn left and follow NH 6 to Kampong Thom - about 2-3 hours. In Kampong Thom, the Arunreas Hotel (062-961294), Stung Sen Royal Hotel (012-309495) and Mittapheap Hotel are all decent mid-range places. Arunras Guesthouses and Restaurant next to the hotel is the place to eat cheaply.
From Kampong Thom to Siem Reap the trip takes another 2 hours. From there you?ll have to search the Major Road 64 to Anlong Veng. This will take you another 6h on bumpy unpaved dirt roads through monotonous dry forest changing sometimes to jungle sections. Going to Samraong: (Share Taxis/Pick Up/Motorbike) Heading west on the NH 6 from Siem Reap you'll reach an intersection after 51km. Turn right and you enter after some 100m a small town called Kralanh (US$1.5 from Siem Reap or Sisophon). From here you take another pick up or share taxi to the North on laterit-paved and bumpy Minor Road 68 (US$2-3, 2-3hours, 65km). Sometimes you can find early taxis leaving to Samraong from Siem Reap (US$4-5).