May or so this year.. They chased us down 20kms into the country.. made us come back top the customs house.. and were simple and sure that there was no way a vehicle was going over.. No bribe, no 'just to siem reap', no sob story about my GF, nothing was accepted..
Then we pretended to leave and just went on in flat out.. they chased us for miles in a camry.. Quite a shocker. Theres no turn off for 45 or so kms until the battambang one.
This was a car but in the office they claimed the same rules applied to bikes.. I showed them entry at stung treng and Koh Kong in my passport and they just flat out didnt want to know. Koh Kong were also a pain in the arse last year around August or so.