Carnet de Passage
A Carnet de Passage is a document that allows you to cross international borders with a vehicle and avoid paying customs charges. It is basically a promise that you will take the vehicle out of the country when you leave, or risk hefty penalties.
The carnet lists comprehensive details on your vehicle and its value, and can be obtained from the local automobile club in your country. Often a bank deposit is also needed.
Countries that require carnets 
Not all countries require carnets, but the following do:
- Central African Republic
- Democratic Republic of the Congo
Asia / Middle East 
- Singapore (except for Peninsular Malaysia-registered and Thai registered vehicles)
- Sri Lanka
- United Arab Emirates