Fault in a Thai road accident is settled at the roadside, by negotiation, between the two insurers' claims surveyors, with the attending police officer's account of the scene as the reference point. It is not decided in a courtroom, and it is not decided by a claims handler reading a file three weeks later. Unless someone has been seriously hurt or a criminal offence is in play, the answer is arrived at within a couple of hours of the collision and everybody moves on.
That has one very practical consequence for a foreign driver. Your ability to influence the outcome is concentrated almost entirely in the first hour, at the scene, and it consists of the photographs you take, the account you give, and whether anyone present can understand you.
Do not leave before this happens. If you are not at the scene when fault is discussed, the account that gets recorded is the other driver's. That is the whole reason Thailand's accident etiquette is "wait", not "exchange details and go".
Who is in the room
Four parties shape the answer, in roughly this order of influence:
- The two insurance surveyors. They agree which policy responds. In most cases their agreement is the outcome. The insurance surveyor at a Thai accident scene explains who they work for.
- The police officer. Records the scene, the statements and, usually, a view on cause. That record is what the insurers and everyone downstream refer back to.
- The drivers. Your account, and whether it is consistent with where the vehicles are.
- The physical evidence. Final positions, damage patterns, skid marks, debris, and the road markings and signs.
Notice what is missing: an independent adjudicator, an appeals process that a visitor can realistically use, and any mechanism that operates after you have flown home. If you disagree with the outcome, your options narrow very fast once you leave the country.
What the law says about priority
Thailand has an entirely ordinary set of right-of-way rules, and they matter, because they are what an officer measures the scene against.
What the law says
Under the Land Traffic Act B.E. 2522 (1979): drive on the left and not beyond the median line (s.33). At a junction, give way to a vehicle already there, and where two arrive together, give way to the vehicle on your left (s.71). A vehicle on a main road has priority over one on a secondary road (s.72). Where a left-turning and a right-turning vehicle meet, the left-turner gives way (s.51). A vehicle emerging from a private road or building must stop and let road traffic pass (s.74). Reversing direction or turning right is prohibited where another vehicle is oncoming or following within 100 metres unless it is safe (s.52), and U-turns are prohibited at junctions unless a sign permits, and on or within 100 metres of a bridge (s.53).
Those rules are the framework. Right of way in Thailand and U-turns in Thailand take them apart properly. But nobody should ride away from this page believing that Thai traffic behaves as though section 71 governs it. Priority at an unsignalled junction is in practice negotiated by size, speed and commitment. Writing "but I had right of way" in your head at the moment of impact is not a defence, and it is not how the afternoon will go.
What actually shifts the answer
Some things carry far more weight at a Thai accident scene than a Western driver expects.
Where the vehicles ended up
This is the single most important piece of evidence, which is why nothing should be moved before it has been photographed and seen. Final positions tell a story about lines of travel, and that story is very hard to argue against afterwards.
Whether you were where you were supposed to be
Riding on the hard shoulder, riding against the flow, coming out of a soi without stopping, crossing a solid line, or straddling lanes are all breaches of ordinary rules and all obvious from the scene. Wrong-way riding on the shoulder in particular — a 2,000 baht maximum offence for driving against the flow of traffic — is a leading cause of head-on collisions involving foreigners who looked right and pulled out. One-way streets and wrong-way riders covers it.
Your legal position as a driver
This is where visitors lose cases they would otherwise win. Riding a scooter on a car-only licence, riding without any licence at all, riding without a helmet, or failing a breath test does not merely add a separate penalty. It reframes the whole discussion, and it is what an insurer reaches for when deciding whether to pay anything at all. The lower 0.02% blood-alcohol limit applies to anyone driving without a valid licence for that class of vehicle — meaning a tourist on a scooter with a car-only licence is effectively on a zero-tolerance limit, whatever their age. See drink-driving limits in Thailand and riding without a licence in Thailand.
Whether you stayed
Leaving is catastrophic. Failing to stop and assist after a collision carries, on the Act's pre-2022 text, up to three months' imprisonment and a fine of 2,000–10,000 baht, and up to six months and 5,000–20,000 baht where serious injury or death results. It cannot be dealt with by a roadside ticket. On a Thai licence it is also a three-point deduction under the demerit points system.
Language
Not a legal factor, and a decisive practical one. A driver who cannot follow the conversation cannot correct it. Calling 1155 for the Tourist Police puts an English-speaking officer into the scene, and it is the highest-value phone call available to a foreign driver who is not injured.
The "bigger vehicle pays" idea
You will read, in forums and in a great many travel blogs, that in Thailand the larger vehicle is automatically held at fault, or that a foreigner is automatically held at fault. Neither is a rule of Thai law, and we have not found any official source that supports either as a stated principle.
What can be said honestly is that visitors commonly report outcomes that feel like that, and there are structural reasons why they might: the foreign driver is usually the one who cannot follow the discussion, usually the one without a local insurer arguing for them, usually the less experienced road user in that environment, and often genuinely in the wrong about a local convention they did not know. Treat "the bigger vehicle pays" as a description of what people report, not as law — and treat it as a reason to have photographs, a police report and an interpreter, which are the three things that make the difference regardless.
Contributory fault, and how it is handled
Thai settlements are routinely split rather than binary — a proportion agreed between the surveyors, reflecting that both drivers contributed. That is usually good news for a visitor, because a scene that looks bad for you rarely ends up wholly your responsibility if the other party also did something wrong. It is another reason not to concede anything early: an apology at the roadside can turn a shared outcome into a sole one.
Describe, do not conclude. "I was travelling north in the left lane at about 50, and the pickup turned across me from the right" is evidence. "I'm so sorry, I didn't see him" is an admission. Both are true statements; only one of them helps you.
If you think the outcome is wrong
Realistically, your routes are limited and they all run through documents. Keep every photograph, get the police report reference, get the claim number, and keep the surveyor's card. If you hold Thai motor cover, take it up with your own insurer, who has a contract with you. If you were in a hire vehicle and the dispute is about what you are being charged, that is a rental matter — see disputing a rental charge in Thailand and the Renting section. If the dispute concerns money owed to you by another driver, if someone hits you in Thailand is the page you want.
Where the stakes are large — serious injury, a substantial claim, any suggestion of a criminal charge — stop reading websites and get a Thai lawyer. That is not a disclaimer; it is the correct next step, and your embassy will hold a list.
Frequently asked questions
Is a foreigner automatically blamed in a Thai road accident?
No, and there is no rule to that effect. Visitors do report outcomes that go against them, and there are structural reasons for it — no local insurer arguing their side, no Thai, unfamiliarity with local road conventions. Photographs, a police report and an interpreter on 1155 address all three.
Does the police officer decide who pays?
Not directly. The officer records the scene and the statements, and usually forms a view on cause. The insurers' surveyors then agree between themselves which policy responds, and that agreement is normally the practical outcome.
Can fault be split between us?
Yes, and it frequently is. Settlements reflecting a share of responsibility on each side are normal rather than exceptional.
Does it go to court?
Ordinary damage-only accidents almost never do. Cases involving death, serious injury, drink or drugs are a different track: those offences are excluded from the fixed-penalty system and go to an investigating officer and the court.
I had right of way. Does that settle it?
It helps a great deal, and it is exactly what the officer will be assessing the scene against. It does not settle it on its own, and it is worth much less if you were riding without the right licence entitlement, without a helmet, or on the wrong part of the road.
What if the other driver has no insurance at all?
Then there is no surveyor on their side and no policy to pay. Compulsory cover attaches to the vehicle, so the registration number is what makes any claim possible — photograph it first, before anything else. After that, your own travel policy is likely to be the whole of your protection.