If denied entry at Friendship Bridge 1 or 2 , use the ferry at Bueng Kan approx 140 kms East of Nong Kai . It only operates on weekdays, it is for trucks mainly. Immigration and customs on the Thai side in one building, Laos side also one building. Both sides keep asking for the motorcycle passport, I just keep saying don't have one, and eventually they do the paperwork without it, all the vehicles crossing have one. The ferry is located approx 10kms west of Bueng Kan, if coming from town there is a passanger ferry first, keep going for another 4 or 5kms to the vehicle ferry. They charge me B200 to cross, a bit steep, they open at 8AM, first ferry at 9.