Hey everyone! Last weekend, I was in the garage, finally getting around to fitting a new front bumper on my project car. Everything was going smoothly until I got to the wiring for that little amber light on the corner. I just stopped and stared at it, thinking, “Can I just delete this thing? It would look so much cleaner.”

Trust me, if you’re asking that question, you’re not the first. That tiny, often-overlooked light—the side marker—is the source of endless debate on forums and in garages. Is it legally required? Is it actually necessary for safety? What are the rules for modifying it?

This little light has a big story to tell. So today, we’re going to demystify it completely. Whether you’re a new driver, a modding enthusiast, or just trying to pass your next vehicle inspection, this guide will give you the straightforward answers you’re looking for. Let’s dive in.

The Quick Answer – Are Side Marker Lights Mandatory?

Let’s get right to it. For those who want the straightforward answer without the technical details, here it is.

The short answer is: Yes, in North America, it is a federal requirement for all modern vehicles. In other regions, such as Europe and Australia, the rules differ, but some form of side visibility is still required.

Think of it this way, in the United States and Canada, the law is particular. Since 1968, federal safety standards have mandated that cars be equipped with side lights and reflectors. This is why you see amber lights on the front corners and red lights on the rear corners of almost every car on the road.

However, if you are in Europe or Australia, you may notice that cars do not always have a constant-on light. Instead, their laws often focus on a flashing side indicator, sometimes called a side repeater, that blinks with your turn signal.

So, while the specific execution changes, the core principle of being visible from the side is a global safety standard. Deleting them completely is rarely a good idea if you plan on driving your car on public roads.

Now, for those who want to understand the “why” and the specific rules applicable to their region, let’s proceed.

What Are They & Why Do They Exist? — More Than Just Decoration

It is easy to get all the lights on a car mixed up. We have headlights, fog lights, turn signals, and brake lights. So where do side markers fit in?

Simply put, they are the small lights located on the front and rear corners of your vehicle. You will almost always find an amber-colored one near the front wheels and a red one near the rear wheels.

Their job is not to help you see the road better. Instead, their sole purpose is to help others see you. Think of them as outline lights. In low-visibility conditions, such as dusk, dawn, fog, or heavy rain, they create a visible footprint of your vehicle from the side. This helps prevent one of the most dangerous types of collisions: the side impact.

What is the main difference between a turn signal and this?

That is a great question, as they are often located near each other.

The key difference is that a side marker is designed to stay on constantly with your headlights, while a turn signal flashes to show you are turning or changing lanes.

A side marker provides information about your car’s presence and length. It silently says, “I am here, and this is how long my vehicle is.” A turn signal, on the other hand, communicates your intent. It actively shouts, “I am about to move over!” Together, they give a complete safety picture to the drivers around you.

The Big Question: Are They Legally Required?

This is the core of the issue for most people. You want to avoid fines, pass inspections, and be on the right side of the law. But as with many things in the car world, the answer is not the same everywhere.

Let’s break down the rules for the major markets.

North America (United States & Canada)

In the United States, the rules are obvious and strict. They are governed by the Federal Motor Vehicle Safety Standard 108, commonly referred to as FMVSS 108. This is a set of rules for all automotive lighting, and it is not just a suggestion.

For any modern passenger vehicle, the answer is an absolute yes; they are mandatory.

The standard requires an amber side marker lamp and a separate amber side marker reflector near the front of the vehicle. At the rear, it requires a red side marker lamp and a red side marker reflector. These lights must turn on and remain on when your parking lights and headlights are activated. Because Canadian vehicle standards are closely aligned with those of the United States, similar rules apply.

(Source: The full text for FMVSS 108 can be found in the U.S. Code of Federal Regulations, Title 49, Section 571.108. You can review it here: https://www.govinfo.gov/content/pkg/CFR-2012-title49-vol6/pdf/CFR-2012-title49-vol6-sec571-108.pdf)

Europe (EU Countries)

The situation in Europe is quite different. Vehicle lighting is governed by the United Nations Economic Commission for Europe (UNECE) regulations, specifically UN Regulation No. 48, which covers the installation of lights.

In Europe, the emphasis is not on constantly having side marker lights, but on flashing side turn signal indicators, often called side repeaters.

These are the small amber indicators you see on the front fenders or integrated into the side mirrors of European cars. They must flash in sync with the central front and rear turn signals. While some vehicles may have additional side position lamps, the mandatory requirement is centered on the flashing indicator.

(Source: The United Nations Economic Commission for Europe outlines these standards. You can learn more about UN Regulation No. 48 here: https://unece.org/transport/vehicle-regulations/un-regulation-no-48)

Australia

Australia’s rules, known as the Australian Design Rules (ADRs), are a great example of a system that has harmonized with international standards.

Australia largely follows the European ECE regulations, meaning the focus is also on side turn signal indicators rather than the North American-style, constantly on markers.

Therefore, cars built for the Australian market will typically feature flashing side repeaters. It is always a good idea for Australian drivers to check the specific rules in their state or territory, but the national standard aligns with the European model.

(Source: The Australian Design Rules are managed by the Department of Infrastructure and Transport. You can find more information here: https://www.infrastructure.gov.au/infrastructure-transport-vehicles/vehicles/vehicle-design-regulation)

A Quick Disclaimer

Laws and regulations can be updated. This guide is based on the standards in effect as of late 2025. If you are ever in doubt, especially before modifying, the best course of action is to check the current vehicle code for your specific state, province, or country.

The DIY Corner: What This Means for YOU

Okay, so we have covered the laws. Now, let’s discuss what this means for you and your car in the real world. Whether you are fixing a problem or trying to change the look of your ride, here is the practical advice you need.

For the Daily Driver & Novice: “My light is out!”

Sooner or later, you will notice one of these little lights is not working. It is tempting to ignore it, but you should not. A dead side marker is a guaranteed way to fail a vehicle inspection in many places, and it can also attract a traffic ticket you do not want.

The good news is that this is often one of the easiest fixes you can do yourself. The most common cause is simply a burnt-out bulb. Replacing it is a great first project for a new DIYer. While every car is different, the steps are usually similar: access the bulb housing (often from the wheel well), twist the socket, pull out the old bulb, and pop in a new one. Ensure you select the correct replacement bulb for your specific car model.

For the Modding Enthusiast: “I hate the orange look!”

I understand completely. That bright amber or red plastic on the side of a clean car is not for everyone. The aftermarket offers a variety of options, including smoked lenses, clear lenses, and complete LED units. But before you buy, you need to be smart.

Smoked or tinted lenses can look great, but they reduce the amount of light that passes through. In some areas, this can be illegal if the light is too dim. Clear lenses are a popular option, but you must use a colored bulb (amber in the front, red in the rear for North America) to be compliant.

What is the most crucial rule when modifying?

Regardless of what you do, you should never alter the required color of the light output.

Putting a white bulb behind a clear front lens might look cool, but it violates the safety standards we discussed. It is one of the fastest ways to get a ticket. Also, be careful with cheap online LED units. They can fail quickly, cause warning lights on your dashboard, or create a “hyperflash” issue with your turn signals. Always buy from a reputable brand.

For the Used & Imported Car Buyer

If you are shopping for cars, especially ones from different countries, you will see these lighting differences firsthand. A vehicle initially sold in Japan or Germany will likely have a flashing side repeater on the fender, instead of the constantly on side marker seen on a Ford or a Chevrolet.

This is perfectly normal. However, if you are importing a car from one of these regions into North America, you may be required to modify the vehicle’s lighting to comply with local laws. This could involve wiring in a new side marker system. It is a critical step to ensure the car can be legally registered and driven on public roads. Always check the specific import requirements for your country of destination.

Beyond the Law: Why Side Markers Are a Genuinely Smart Idea

We have spent a considerable amount of time discussing rules and regulations. It is easy to think of these lights as just another box to check for an inspection. However, the truth is that they are one of the simplest and most effective safety features on your entire vehicle. The laws exist for a very good reason.

Imagine this scenario. You are pulling out onto a main road at dusk. The streetlights have not fully kicked in yet, and the sky is that tricky shade of dark blue where things are hard to see. You look to your left and see nothing. You start to pull out.

Suddenly, you catch a tiny amber glow from the corner of your eye. It is the side marker of a car that is still far enough away that its headlights are not pointed at you. That little light is the only thing telling you a car is actually there. You hit the brakes, and a potential accident is avoided.

That is the magic of the side marker. Headlights are powerful, but they only project light forward. They do almost nothing to illuminate the side of a car. Without side markers, a vehicle approaching you from the side at an intersection can be nearly invisible in low light until it is too late.

They fill a critical visibility gap. They provide the crucial information that turns a vague dark shape into something your brain immediately recognizes as a vehicle. It is a simple feature, but it has undoubtedly prevented countless accidents at intersections, in parking lots, and during lane changes.

So even if you are tempted to remove them for a cleaner look, it is worth remembering the job they do. They are a silent, simple piece of safety equipment that works to protect you, your passengers, and everyone else on the road.

Final Thoughts: The Little Lights That Matter

We have progressed from a simple question about a small light to a comprehensive exploration of international law, DIY tips, and safety scenarios.

If you take away just a few things from this guide, let them be these:

First, those little side lights are more than just decoration. They are a key piece of safety equipment designed to make you visible and keep you safe.

Second, laws are not uniform everywhere. What is mandatory in North America is different from the standard in Europe and Australia. Always familiarize yourself with the rules for your specific location.

And third, if you decide to modify your side markers, always prioritize safety and compliance with the law. The most important rule is to never, ever change the required color of the light.

At the end of the day, our cars are an extension of our personality, but they also come with significant responsibilities. Understanding how even the most minor parts work helps us become smarter owners and safer drivers.

Now, I’d like to hear from you. What are your experiences with side marker lights? Have you completed a cool modification you are proud of, or maybe have a story about how it made a difference on the road?

Drop a comment below and share your story with the community!

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