Changes

There's a bus with the number 68A that leaves from near Khao San Rd. and will drop you off right near the highway somewhere south of Bangkok if you ride it to its last stop. To find it, go North from the Eastern end of Khao San Rd. until you come to a roundabout. On your right, there should be Thanon Bowon Niwet (Bowon Niwet Rd.) where bus 68A begins in front of the big Wat. Once you've arrived at the last stop, keep walking in the direction you've come from and you'll hit the highway very soon. The exit of the resort there appears to be a good spot.(NOTE: as of August 2017, it appears that there is no "68A" bus. The 68 bus is free; it leaves from the same location described; and it definitely goes in the right direction. However, if you ride it to the end, you'll end up in a very urban area with no good places to hitchhike.)