Cambodia Speed Limits Explained: City, Highway, and Residential Roads

By Testdrive KH team · June 17, 2026

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If you’ve driven - or ridden - on Cambodian roads for more than a few minutes, you’ve probably noticed that speed limits aren’t always obvious. Some roads have clear signs, others don’t seem to have any, and the “real” speed everyone drives at often looks faster (or slower) than what feels official. For both the theory test and everyday safety, it’s worth understanding how speed limits actually work in Cambodia - even in general terms.

Quick summary: Cambodia generally uses lower speed limits in cities, towns, and residential areas, higher limits on open roads and national highways, and the highest limits on expressways. Motorbikes often have lower limits than cars and trucks on the same road. This article describes typical ranges and the sign system - always follow the posted speed limit sign for the specific road you’re on, since exact figures are set by regulation and can change.

Why speed limits matter on Cambodian roads

Speed limits exist because the right speed depends on the road, not just the vehicle. A speed that’s perfectly safe on a wide, straight national highway can be dangerous on a narrow street shared with pedestrians, street vendors, parked vehicles, and motorbikes pulling out of side alleys. Cambodia’s mix of road types - from busy urban streets to rural roads to newer expressways - means the appropriate speed genuinely changes from one stretch of road to the next.

For learner drivers, speed limit questions are also a regular part of the Speed & Alcohol Limits category on the theory test. But beyond the exam, understanding why limits are set the way they are - and developing a feel for what’s a safe speed in different environments - is one of the most useful skills a new driver or rider can build.

General speed limit framework: urban, open road, and expressway

Cambodia’s speed limit system broadly follows a structure you’ll recognize from many other countries: lower limits where there’s more activity and risk around the road, and higher limits where the road is more controlled and separated from pedestrians and cross-traffic. While exact numbers depend on the specific road and current signage, the general pattern looks like this:

• Urban and residential areas - towns, city streets, and residential neighborhoods typically have the lowest speed limits, often in the 30-40 km/h range. These are areas with frequent intersections, pedestrians, cyclists, parked vehicles, and motorbikes entering and exiting traffic constantly.
• Open roads outside built-up areas - national and provincial roads that run between towns, away from dense development, generally allow higher speeds than urban areas, often somewhere in the 60-90 km/h range depending on the road and vehicle type.
• Expressways - Cambodia’s newer expressways (such as the Phnom Penh-Sihanoukville expressway) are designed for higher-speed travel and typically post the highest legal speed limits in the country, well above what’s allowed on ordinary national roads.

These ranges are meant as general orientation, not exact figures to memorize for a specific road. The Cambodia speed limit km/h that actually applies to you is whatever is shown on the posted sign for that stretch of road - and in the absence of a sign, a more conservative default applies based on the road type and area. If you’re ever unsure, slow down rather than assume the higher end of the range applies.

How speed limits differ for motorbikes vs. cars and trucks

One detail that catches a lot of people off guard - including experienced drivers from other countries - is that the speed limit for motorbikes in Cambodia is often lower than the limit for cars and trucks on the same road, particularly outside towns and on faster roads.

The general logic is straightforward: motorbikes and scooters are more vulnerable in a crash, have different stability and braking characteristics at higher speeds, and make up the large majority of vehicles on Cambodian roads. As a result, regulations have historically set separate (often lower) maximum speeds for two-wheelers compared to cars, vans, and trucks on certain road types.

What this means in practice:

• On some roads, you may see two speed limit figures posted, or separate signage indicating a lower limit for motorbikes/mopeds.
• Even where signage doesn’t explicitly separate vehicle types, it’s worth knowing that the “comfortable” speed for a small-displacement scooter is often well below what a car could safely do on the same road - so the lower limit usually matches the safer riding speed anyway.
• If you hold (or are studying for) a motorbike license, pay close attention to any motorbike-specific speed questions in your theory prep. Our guide to motorbike license requirements in Cambodia covers the broader licensing picture if you’re working toward a two-wheeler license.

When riding a motorbike, the safest habit is to treat any general speed limit as an upper ceiling that may not even be appropriate for your vehicle - not a target to aim for.

Recognizing speed limit signs in Cambodia

Speed limit signs in Cambodia follow the same shape-and-color logic used for other prohibition signs, which we cover in more depth in our guide to understanding Cambodian road signs:

• Shape: circular.
• Color: white background with a red border.
• Content: the maximum speed in km/h, shown as a number in black in the center of the circle.

Because a red-bordered circle generally means “you must not do this,” a speed limit sign is really telling you “you must not exceed this number” - it’s a maximum, not a target or a suggestion. You may also encounter:

• End-of-restriction signs - often shown as the same number with a diagonal line through it, or a “national speed limit applies” style sign, indicating that the previous limit no longer applies and a different default takes over.
• Minimum speed signs - less common, these use a blue circular background (a “must do” mandatory sign) rather than red, and indicate a minimum speed rather than a maximum - typically only seen on certain expressway sections.

If you want to get fast and confident at recognizing these (and other) signs at a glance, the road sign flashcards on Cambodia Test Drive are a quick way to build that recognition before exam day.

School zones and other reduced-limit areas

Even on roads where a higher general limit applies, certain areas almost always call for a lower speed - whether or not a specific sign is posted for that exact spot:

• School zones - areas around schools, especially at drop-off and pick-up times, often have reduced speed limits and/or additional warning signs. Even where a formal reduced limit isn’t signed, the presence of large numbers of children crossing or walking near the road means slowing down well below the general limit is simply common sense.
• Markets and busy commercial strips - roads lined with shops, vendors, and parked vehicles function more like residential streets than open roads, regardless of what the “official” limit for that road class might technically be.
• Near hospitals, pagodas, and other community areas - similar logic applies: high pedestrian activity means a lower safe speed, sign or no sign.
• Poor visibility or road conditions - fog, heavy rain, dust, potholes, or roads under construction are all situations where the legal limit may still apply, but the safe speed is meaningfully lower.

A useful mental rule: the posted speed limit is the maximum allowed under good conditions - not a number you’re entitled to drive at regardless of what’s actually happening on the road around you.

Speeding consequences: a brief overview

Exceeding the speed limit in Cambodia is a traffic violation that can result in a fine, and in more serious cases - particularly where speeding contributes to an accident - more significant consequences. We’ve covered how Cambodia’s fine and enforcement system works more generally, including checkpoints and what to expect if you’re stopped, in our guide to Cambodia traffic fines and penalties, so we won’t repeat that here.

The short version: speeding is treated as one of the standard violation categories alongside things like helmet and license checks, and traffic police on major roads (especially highways and during holiday travel periods) do monitor for it. Beyond any fine, though, the bigger cost of speeding is the obvious one - less time and distance to react if something unexpected happens, which on Cambodian roads (mixed traffic, unmarked turns, animals, pedestrians) happens more often than on roads designed with more separation.

Tips for safe speed judgment as a new driver

Reading speed limit numbers is only half the job - the other half is developing a feel for what speed actually feels safe in different situations, especially if you’re new to driving or to Cambodian roads specifically:

1. Watch for the road type changing, not just signs. Limits often change at the boundary between a town and the open road, or where an expressway begins or ends - sometimes with clear signage, sometimes signaled mainly by the road itself narrowing, widening, or changing surface.
2. Match your speed to what you can see and react to, not just to the sign. If you can’t see far ahead - because of a curve, parked trucks, or dust - slow down below the limit until visibility improves.
3. Leave extra margin on a motorbike, especially with a passenger, cargo, or in wet conditions, where braking distances and stability change more than they do for a car.
4. Don’t match your speed to surrounding traffic if it’s clearly over the limit. It’s tempting to “go with the flow,” but the limit is the limit regardless of what other drivers are doing.
5. Slow down early for intersections, crossings, and entrances - especially in areas with motorbikes and pedestrians who may not always wait for a clear gap before entering the road.

Practice the Speed & Alcohol Limits category

Speed limits and related rules are a core part of the theory test, and they’re exactly the kind of question where understanding the general framework (rather than memorizing one specific number) pays off - because the test can phrase questions about urban roads, open roads, or motorbike-specific limits in different ways.

Work through the Speed & Alcohol Limits category on Cambodia Test Drive to see how these questions are typically asked, then take a full mock exam under timed conditions to make sure you can apply what you’ve learned quickly and confidently.

A note on accuracy

This article is general guidance only and not legal advice. The speed limit figures and ranges mentioned here are typical/general examples intended to help you understand how Cambodia’s speed limit system is structured - they are not a definitive list of current legal speed limits, which are set and periodically updated by Cambodian government regulation and can vary by specific road and signage. Always follow the posted speed limit signs for the road you’re actually on, and confirm current rules with the General Department of Land Transport, the Ministry of Public Works and Transport, or your local traffic police if you need an authoritative answer.