I see a lot of indifference on Thai roads: you should drive in the left lane but a very high percentage of vehicles with four or more wheels, including the police, travel in the overtaking lane. You honk and flash them and they put on their right indicator to let you know that they are staying there, forcing you to overtake them incorrectly and risk finding a car that is driving regularly. They fine those who do not wear a helmet but I have never seen cars stopped and fined for driving in the overtaking lane...!