Right of Way Rules in Cambodia: Intersections, Roundabouts, and Priority Explained

By Testdrive KH team · June 19, 2026

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If there’s one topic that trips up learner drivers on Cambodia’s theory test - and confuses drivers on the road every single day - it’s right of way. The rules themselves aren’t complicated, but applying them at a real intersection, roundabout, or pedestrian crossing often feels very different from the clean diagrams in a study guide. This guide walks through the core right-of-way principles used in Cambodia, scenario by scenario, so you understand both what the test expects and how to apply it safely on the road.

Quick summary: at unmarked intersections, give way to traffic from the right; signs, signals, and markings always override the general rule when present; on roundabouts, give way to traffic already circulating; when merging, give way to traffic already in the lane you’re joining; pedestrians at crossings generally have priority. In all cases, defensive driving - yielding even when you technically have priority - is the safer choice.

Why right-of-way rules are confusing (and heavily tested)

Right-of-way rules exist to answer one question: when two vehicles (or a vehicle and a pedestrian) could occupy the same space at the same time, who goes first? On paper, this is straightforward. In Cambodia, it gets complicated for a few reasons.

First, many intersections - especially in residential areas, smaller towns, and rural roads - have no signs, signals, or lane markings at all. The “rule” has to be inferred from general principles rather than read off a sign. Second, even where rules exist, not every driver follows them, which means the legally correct answer and the safe real-world action aren’t always the same thing. Third, the theory test often presents right-of-way questions as scenarios (“you’re approaching an intersection and a motorbike is coming from your right - who goes first?”) rather than asking you to recall a fact, which means you need to actually understand the underlying logic, not just memorize an answer.

This is exactly why right-of-way questions are one of the most common categories where prepared drivers still lose points - and why this topic deserves a dedicated, careful look rather than a quick mention.

Unmarked intersections: the general priority rule

When you reach an intersection with no traffic lights, no stop or yield signs, and no road markings indicating priority, the general rule used in Cambodia (as in many countries) is:

Give way to traffic approaching from your right.

So if you and another vehicle arrive at an unmarked crossroads at roughly the same time, and the other vehicle is on your right-hand side, you let them go first. If the other vehicle is on your left, you generally have priority - but that doesn’t mean you should barrel through without looking.

A few practical notes that matter both for the test and for real driving:

• “Roughly the same time” is doing a lot of work. If you clearly arrive first and it’s safe to proceed, you don’t need to wait indefinitely for a vehicle that’s still some distance away. The rule is about resolving genuine conflicts, not about who technically reaches an invisible line first.
• A larger or more major-looking road doesn’t automatically have priority unless this is indicated by signs or markings. Many learners assume the busier-looking road “obviously” has right of way, but without a sign confirming that, the from-the-right rule still applies at a genuinely unmarked junction.
• T-junctions are a common exception in practice. Traffic on the through road (the top of the “T”) generally has priority over traffic emerging from the side road (the stem of the “T”), even without a sign, simply because the side road is joining an established route. If you’re on the side road, treat it as if you’re required to give way.

When in doubt at an unmarked intersection, slow down well before you reach it, check both directions, and be prepared to stop. This single habit avoids the vast majority of intersection collisions, regardless of who technically had priority.

Intersections with signs, signals, and markings

Whenever an intersection has a stop sign, give-way (yield) sign, traffic light, or painted lane markings indicating priority, those instructions always override the general from-the-right rule. This is one of the simplest but most important points on the whole topic:

• A stop sign means you must come to a complete stop, even if the road looks clear, before proceeding when safe.
• A give-way (yield) sign means you must let traffic on the priority road pass before entering or crossing, but you don’t need to stop completely if the way is already clear.
• A traffic light controls right of way directly - green means proceed if safe, amber means prepare to stop, and red means stop. Right of way at a light-controlled junction is determined entirely by the signal, not by which direction you’re coming from.
• Painted arrows, stop lines, and lane markings indicate which lanes can go straight, turn left, or turn right, and where you must stop or give way. Ignoring these (for example, turning from a straight-only lane) creates exactly the kind of right-of-way conflict the rules are designed to prevent.

For a refresher on recognizing the signs themselves, see our guide to understanding Cambodian road signs - knowing what a sign looks like and knowing what it means for right of way are both tested, and they reinforce each other.

Roundabout rules in Cambodia

Roundabouts (traffic circles) have their own right-of-way logic, and they’re a frequent source of theory test questions and real-world confusion alike.

Cambodia drives on the right-hand side of the road, which means traffic on a roundabout travels in a counter-clockwise direction. The core right-of-way roundabout rule is:

Traffic already on the roundabout has priority over traffic entering it.

In practice, this means:

• As you approach a roundabout, slow down and look to your left for traffic already circulating (since that’s the direction it will be coming from to reach your entry point).
• Wait for a safe gap before entering - don’t force your way in just because you arrived at the entry point first.
• Once on the roundabout, stay in your lane unless you need to change lanes to exit, and signal your intention to exit in advance so other drivers (and pedestrians) know what you’re doing.
• Larger roundabouts may have multiple lanes with different rules for which lane to use depending on your exit - generally, the inner lane is for vehicles continuing further around, and the outer lane is for those exiting soon. Lane discipline on roundabouts matters not just for right of way but for avoiding side-swipe collisions as vehicles cut across lanes to exit.

The key exam takeaway: if you’re entering a roundabout, you give way to traffic already on it - not the other way around, regardless of which road looks “more important.”

Merging and lane changes: who has priority?

Merging situations - where two lanes of traffic combine into one, or where a vehicle is joining a road from a slip lane, driveway, or smaller side road - follow a similar underlying principle to intersections:

The vehicle already established in the lane or roadway generally has priority. The merging vehicle gives way.

This applies whether you’re:

• Joining a main road from a side street or driveway,
• Merging onto a busier road from an acceleration lane, or
• Changing lanes because your current lane is ending.

In all of these cases, the responsibility is on the vehicle that is moving into a space already occupied (or about to be occupied) by other traffic to find a safe gap, signal clearly, and merge smoothly - not to force other vehicles to brake or swerve.

A practical note for Cambodian roads: merges often happen gradually and informally, with vehicles (especially motorbikes) filtering into traffic at low speed from many directions at once. The legal rule is clear, but the safest approach is the same one that applies everywhere in this guide - slow down, make your intentions visible early with mirrors and signals, and don’t assume other drivers will create space for you.

Pedestrian crossings and right of way

Pedestrian right of way is one of the most important - and most commonly overlooked - parts of this topic. The general principle is:

Pedestrians have right of way at marked pedestrian crossings, and when crossing at intersections where no signal tells them to stop.

For drivers, this means:

• Approaching a marked pedestrian crossing (zebra crossing or similar), slow down and be prepared to stop if someone is waiting to cross or already crossing.
• At intersections, even without a dedicated crossing, pedestrians legally crossing with the flow of traffic (for example, on a green light for their direction) generally have priority over turning vehicles.
• Never overtake another vehicle that has stopped at a crossing - it may be stopped because a pedestrian is crossing and is hidden from your view.

The honest reality on Cambodian roads is that drivers frequently don’t stop for pedestrians, and pedestrians often cross mid-block rather than at designated crossings. This doesn’t change the legal rule (which is what’s tested), but it does change the practical advice for both sides: drivers should always slow down near crossings and be ready to stop, and pedestrians shouldn’t assume that having right of way means a vehicle will actually stop. Right of way is a legal concept - it doesn’t physically protect anyone.

Special cases: emergency vehicles and “priority in practice”

A few situations don’t fit neatly into the categories above, but come up often enough to be worth addressing directly.

Emergency vehicles (ambulances, fire trucks, police vehicles using lights and sirens) generally have priority over all other traffic, regardless of the normal right-of-way rules at that location. When you see or hear an emergency vehicle approaching, the correct response is to move toward the side of the road where it’s safe to do so and let it pass - not to stop suddenly in its path or continue as normal.

Larger vehicles in mixed traffic is a more delicate topic, but worth being honest about. On Cambodian roads, you’ll often share space with trucks, buses, and other large vehicles that may not always strictly observe right-of-way rules, simply due to their size, momentum, and limited visibility from the cab. The legal right-of-way rules don’t change based on vehicle size - a smaller vehicle with priority is still legally entitled to go first. But from a defensive driving standpoint, it’s often safer to give way to a larger vehicle even when you technically have priority, simply because the consequences of a collision are far more serious for you. This isn’t an endorsement of larger vehicles ignoring the rules - it’s a recognition that avoiding a crash matters more than being technically correct, and that smaller, more maneuverable vehicles are often better placed to yield safely.

This connects to a broader point worth repeating throughout this guide: legal right of way and real-world driving behavior aren’t always the same thing. The theory test asks about the legal rules, and you should know them well. But on the road, defensive driving - slowing down, watching for what other road users are actually doing, and yielding even when you don’t strictly have to - is consistently the safer approach, and it’s a habit worth building from day one.

How to study right-of-way rules effectively

Because right-of-way questions are usually presented as scenarios rather than simple facts, the best way to study them is through practice, not memorization. A few tips:

• Work through the Traffic Rules category in category practice, which covers right-of-way, intersections, roundabouts, and related questions in depth.
• Read the explanation for every question you get wrong, even if you eventually picked the right answer by guessing. Right-of-way questions often hinge on a small detail (which sign was present, which direction traffic came from) that’s easy to miss.
• Once you’re comfortable with the category, take a full mock exam under timed conditions. Right-of-way questions can take longer to think through than sign-recognition questions, so practicing under time pressure helps.
• Review related topics together - right-of-way rules connect closely with the road signs that control them and with common mistakes test-takers make on this exact category.

A note on accuracy and safety

This guide explains general right-of-way principles based on Cambodia’s Law on Road Traffic and common driving conventions, written to help you prepare for the theory test and drive more confidently. It isn’t a substitute for official guidance - always confirm specific rules with the MPWT “Cambodia Driving Rules” app or a registered driving school if you’re unsure.

And on the road, remember: being legally right doesn’t prevent a collision. Whatever the rule says, if yielding avoids a crash, yield.