Thailand on a Brazilian Licence — IDP Required + the Left-Side Switch

For a Brazilian driver, Thailand flips one expectation you might not see coming: the alcohol rules get more relaxed, not less. But that is the small surprise. The big one is mechanical — you move from the right-hand side of the road to the left, in some of the busiest two-wheeler traffic you will ever drive through.

IDP required — no exceptions

Thailand does not accept a Brazilian licence on its own. An International Driving Permit is required, carried together with your CNH and passport. Police do check at roadblocks, and a missing IDP can invalidate rental and travel insurance after an accident — an expensive way to learn the rule. Apply for the IDP in Brazil before departure; it is not available once you land.

The side switch in motorbike country

Brazil drives on the right; Thailand drives on the left. The reversal alone needs a day of concentration, but Thai roads layer on a constant stream of motorbikes filtering, undertaking and cutting across at junctions. That mix is what makes the early hours hard. Start somewhere quiet, make “keep left” your default, and treat every mirror check as a search for a scooter you didn’t expect.

A looser alcohol limit — but stay sharp

Here is the reversal: Thailand’s limit is 0.05 BAC, whereas Brazil runs near-zero tolerance under the Lei Seca. The legal margin is wider, but the road environment is far less forgiving — unpredictable overtaking, loose lane discipline and poor rural lighting. The smart call is still to drink nothing before driving.

Speeds and costs

Limits are 50 km/h urban, 90 rural and 120 km/h on motorways, with a low-level speeding fine around THB 500-1,000, though enforcement is patchy. Fuel is cheap at roughly $1.25/litre, and the emergency number is 191.

See the full rules on our Thailand driving guide, confirm the IDP requirement with the Driving Permit Checker, and estimate any penalty with the Speeding Fine Calculator.