its good for a year to travel with thailand its only valid for 90 days ( tourist stamp ) if you are here for example on a DTV it will only be good for 90 days
yes a fine not to exceed 2000 baht and or 1 month in jail. That is what the law says, fact you just get a 500 baht fine is the discretion of the cop at the time
for Americans you have to get the state department involved to use reciprocal agreements, taking the course and test here is faster and beneficial to understand the laws here just my opinion. Driving in thailand IS NOT driving in the states
its a heads up for people who use the border runs scheme wishing to stay here for more then 90 days as the IDP is only good here for 90 days. Personally its just a good idea to get a license here if people wish to stay longer then 90 days, meaning if they do 60 days and then run the border come back over and over again. Just smarter to get the temp 2 year license then face a fine up to 2000 baht and or 1 month in jail