Many years ago I was pulled over on a motorway slip road when returning to Pattaya from Suvarnabhumi. The copper had no English, but showed me a crumpled bit of paper with 120 kph written on it in pencil. Being that I was only doing about 80 I argued the toss, but he was insistent. I gave in when he stuck his hand in the car and said "200 baht". I know I know, but it had been a long day and I was anxious to be on my way.
After that, I downloaded a navy badge from the internet and stuck it on my windscreen. I haven't been stopped again in 16 years.