Thailand on a UK Licence — Same Side, But an IDP Is the Law

For once, a destination where British drivers do not have to retrain the most basic instinct: Thailand drives on the left, exactly as you do at home. The roundabouts turn the way you expect and your mirror-checks point the right way. That makes Thailand one of the easier countries on paper for a UK visitor — and yet the single thing that catches Britons out has nothing to do with which side you sit on.

It is the permit. Thailand makes an International Driving Permit legally mandatory, not merely advisable. Your photocard licence on its own is not valid here, rental desks insist on the IDP, and traffic police at checkpoints do ask for it. Apply through the Post Office or the AA before you fly — you cannot arrange one once you have landed, and an officer who finds you without it can treat you as unlicensed. Carry the IDP, your UK licence and your passport as a set; the IDP is good for the length of your entry permit, usually up to three months.

The real driving challenge is the traffic itself. Thailand’s roads carry a constant swarm of motorbikes that filter, undertake and emerge from side sois with little warning, and lane discipline is loose by British standards. In Bangkok and the islands, expect bikes on both sides at once. Build in extra following distance, check your nearside mirror obsessively, and accept that progress is slower than the map suggests. Our Thailand driving guide breaks down the local habits worth knowing before you collect a car.

Speed limits run 50 km/h in town, 90 on rural roads and 120 on the motorways — broadly similar to home, though the 120 km/h tollways feel faster because the surrounding traffic varies so wildly in speed. Enforcement is patchy but real, mainly via fixed cameras near cities. Drifting 10 km/h over typically costs THB 500–1,000 (around €13–26), and you can sanity-check any penalty with the speeding fine calculator.

On alcohol, do not lean on your home habits. Thailand sets 0.05 BAC against the 0.08 used in England and Wales, and checkpoints around nightlife districts are common. The honest answer is zero before you drive.

Before you set off, confirm the IDP requirement with the driving permit checker, and if you do pick up a ticket, our guide to who pays driving fines abroad explains how rental firms pass them on. The emergency number is 191 for police, 1669 for an ambulance.