Driving in Thailand is an interesting experience and can be a more convenient way to get around while you're on holiday. A driver's license in English from your country of origin or a valid International license is all you need to start driving in Thailand, with vehicles driving on the left hand side of the road. Road signs are expressed in both English and Thai.
When driving in Thailand it's important to remember that road 'rules' and etiquette are different than what you might be used to at home. In Thailand, tailgating is common and people often cut into lines of cars or cut each other off, however no anger is displayed on the roads and this kind of behaviour is actually just accepted.
Driving in Thailand during the day is a bit of an adventure however driving at night is not recommended, particularly for tourists as there is heavy truck traffic and the drivers tend to have little regard for other cars on the road. Motorbikes can also be a bit of a hazard as they often drive straight into oncoming traffic. However major routes outside of the city and around tourist/resort areas are generally quite safe.
As in most western countries, using a mobile phone while driving is illegal in Thailand and if you break this rule, you risk being pulled over and issued with a fine. If you are pulled over for any reason while driving in Thailand, provide your car rental documents and license to the officer who may also request your passport. If you are issued with a ticket, your license will be seized and you will have to go to the closest police station to pay your fine in order to get your license back.