Introduction: Those Little Amber & Red Lights on Your Car – Do You Really Know Them?

Alright, everyone, settle in. Let’s discuss something I’m frequently asked about, especially by new drivers. It’s that moment when the sun is setting, the sky is that greyish-blue color, and you start wondering, “Okay, it’s not dark enough for my main headlights, but I feel like I should have some lights on. Which ones do I use?”

You’re probably thinking of those small lights on the corners of your car—the amber ones at the front and the red ones at the back. Those, my friends, are your side marker lights.

Let’s be clear: they aren’t your powerful headlights designed to light up the road ahead. They aren’t your bright Daytime Running Lights (DRLs) meant to make you seen in broad daylight. Their job is much simpler, but just as critical: to show other drivers your car’s outline—its total length and width—when visibility starts to drop. Think of them as your car’s way of saying, “Hey, I’m here, and this is how much space I take up!”

In this guide, we’ll cut through the confusion. We’ll cover when to use them, what the law says in places like North America, Europe, and Australia, and why these little lights are one of the most underrated safety features on your vehicle. By the end, you’ll be using them like a pro.

Why Bother with These Little Lights? The Big Deal About Safety & Regulations

So, they show your car’s outline. You might be thinking, “Is that really a big deal?”

Let me answer that with a quick story. Picture a dark road on a rainy night. A driver has pulled their car onto the shoulder. Without side marker lights, their vehicle is just a dark shape, blending into the gloom. From a distance, another driver might not realize it is a full-sized car until it is too late.

Now, imagine that same car with its amber and red side markers glowing. Instantly, the approaching driver sees not just a random light, but the complete profile of a vehicle. They understand its size and position immediately. That small, simple light can be the difference between a safe pass and a serious accident.

These lights are not just a good idea; they are the law. And the rules change depending on where you are in the world.

So, what does the law require?

• In North America (the United States & Canada), the answer is: they are absolutely mandatory. For decades, regulations have required all passenger cars to have them. The rule is strict and straightforward: amber (yellow) for the front side markers and red for the rear side markers. This color coding helps other drivers instantly know which end of your car they are looking at.
  • Source: This is standardized under the U.S. Department of Transportation’s Federal Motor Vehicle Safety Standard 108. You can see the detailed regulations on the official U.S. Government Code of Federal Regulations website. (https://www.law.cornell.edu/cfr/text/49/571.108)

• In Europe, the situation is similar: a standard requirement is in place for all new cars. European regulations, often set by the United Nations Economic Commission for Europe (UNECE), mandate their use. While amber is the most common color for side markers throughout the vehicle, the rules can sometimes be more complex, depending on the vehicle’s length.
  • Source: These rules are detailed in UN Regulation No. 48. You can explore the official text at the UNECE website. (https://unece.org/transport/vehicle-regulations-wp29/standards/addenda-1958-agreement-regulations-0-20 Note: This links to the series page; R48 is the specific regulation on installation of lighting.)

• In Australia, side marker lights are also required, and the rules generally align with European standards. Governed by the Australian Design Rules (ADRs), they are considered a key safety feature, especially given the country’s long, dark highways. Amber lights are typically required for the front and side, with red at the rear.
  • Source: The Australian Government’s vehicle standards rules provide the specifics. The relevant rule is ADR 13/00. (https://www.infrastructure.gov.au/infrastructure-transport-vehicles/vehicles/vehicle-design-regulation/australian-design-rules)

And for car enthusiasts and history buffs, this is not a new invention. The United States actually mandated them as far back as 1968, after studies showed that they significantly reduced nighttime turning and lane-change accidents. They started as simple reflectors but evolved into the glowing LED strips we see on modern cars today. They are a classic example of a simple feature making a significant impact on road safety.

“Okay, Coach, Just Tell Me WHEN to Use Them!” – A Scenario-Based Practical Guide

This is the most crucial question, so let’s address it directly. I have a simple rule for all my students, and I want you to remember it.

When should you use your side marker lights?

• The golden rule is: anytime your visibility or daylight starts to fade, turn them on. Think of them as your first step in using your car’s lighting system.

Most cars turn on the side marker lights with the first click of the headlight stalk. It is the setting right before your main headlights turn on. Let us look at the specific times you should reach for that switch.

• During Dusk and Dawn

This is the optimal time to use them. The sun is setting or just rising. It is not dark enough for full headlights, which can sometimes feel too bright. However, it is definitely not bright enough to drive without any lights. Using your side marker lights makes you visible to everyone else on the road without needing your main beams.

• In bad weather

When it starts to rain or you are driving in fog, mist, or even on a very overcast day, your visibility drops significantly—other drivers may not be able to see you as easily. Flipping on your side marker lights gives them a clear signal of your location and size long before your car becomes a grey shape in the haze.

• When Entering Tunnels or Parking garages

You are transitioning from bright daylight to a dark environment. While your eyes adjust, your car can be nearly invisible to others for a few critical seconds. Make it a habit to turn on your side marker lights (or headlights) before you enter. It is a small action that makes a huge difference.

• When Parking on the Side of the road

If you need to pull over to a street with no streetlights or a poorly lit area, Your Side Marker Lights Are essential to keep your car’s outline visible to traffic. For maximum safety in this situation, you should also turn on your hazard lights (the button with the red triangle).

• A Quick Word on “Auto” Headlights

Many modern cars have an “AUTO” setting for their headlights. This is a great feature, but the sensors are not always perfect. They can sometimes wait too long to turn on in gloomy weather or at dusk. My advice as your coach is to be brighter than the sensor. If you feel that visibility is getting low, do not wait for the car to make the decision for you. Turn the switch to the manual-on position for your side markers or headlights. You are the driver, and you are in control.

A Special Heads-Up! – Tailored Advice for Specific Drivers

Now, let’s address a few specific groups of people, as your situation may be a bit different. If you own an imported car, are shopping for a used one, or plan on driving across borders, this is for you.

For Used Car Buyers and Import Car Owners

You’ve found a great deal on a used car, or perhaps you’ve imported your dream car from Europe or Japan. That is fantastic! However, when it comes to lighting, you need to be an extra careful detective.

What should you look for?

• First, verify that the lights are functioning correctly. This is simple. Just turn the headlight switch to the first position and walk around the car. Both front and rear side marker lights on both sides should be lit.

• Second, and this is very important, check the color. Remember the rules we discussed. If you are in North America, the front side markers must be amber and the rear ones must be red. No exceptions. Some European or Japanese cars might have clear or white front side markers. While that is legal in their home country, it is not compliant in the U.S. or Canada and could get you a ticket.

• Finally, check the condition of the light housing. Look for cracks, fogginess, or any water inside. Damaged housing can cause the bulb to fail quickly, and it is something you will want to fix.

For Cross-Border and International Drivers

Planning a road trip from Canada to the United States? Or maybe you have shipped your personal car over from Europe for a long-term stay? Driving in a new country is an adventure, but you need to know the local rules.

What is the main thing to remember?

• The most crucial point is that North American lighting regulations, particularly the rule regarding amber front and red rear side marker colors, are unique and strictly enforced.

If you are driving a European-spec car in the U.S., for example, your white front side markers could attract the attention of law enforcement. While an officer might issue a warning, they could also give you a “fix-it” ticket, requiring you to change the lights to comply. Before embarking on a long international road trip, it is always a good idea to do a quick search of the local lighting laws for your destination. It can save you a lot of hassle.

Common Mistakes & Pro-Tips

Before we conclude, I’d like to address a few common points of confusion that I frequently encounter. Getting these right is what separates a good driver from a great one.

“Are my Daytime Running Lights (DRLs) the same as side markers?”

• No, they are very different, and you should never rely on your DRLs for low-light situations.

This is probably the biggest mistake drivers of modern cars make. Daytime Running Lights are bright, forward-facing lights that automatically turn on to increase your visibility during the day. Here is how they differ from side markers:

1. Purpose and Brightness: DRLs are very bright, allowing them to stand out in sunlight. At night, that brightness can create glare for other drivers. Side markers are dimmer and designed for low-light conditions.
2. Location: DRLs are only on the front of your car. Critically, when your DRLs are on, your rear lights are usually off. This means drivers behind you cannot see you. Side markers illuminate both the front and rear of your car.

“Are side markers the same as position lamps or clearance lights?”

• Essentially, yes, for most passenger cars, these terms mean the same thing.

You will hear a variety of names mentioned. While “clearance lights” is a term usually reserved for massive trucks and trailers, “position lamps” and “side marker lights” are often used interchangeably. They all refer to the same basic system that activates your front amber, rear red, and dashboard lights to indicate your car’s position and outline.

Coach Wang’s Pro-Tip

Once a week, take thirty seconds before driving off at night to do a “light check.” Turn the switch to the first position, get out, and walk around the car. Then, please turn on your headlights and check them. This habit ensures all your lights are working, not just your side markers. Think of it as a pilot’s pre-flight check for your car. It is a simple routine that guarantees you are always safe and visible.

Conclusion: Your Lights Are Your Voice – Use Them Wisely

So, there you have it. The small but mighty side marker light is not just another switch in your car. It is a fundamental tool for safety and communication on the road.

It is your way of telling other drivers, “I am here, and this is my space,” long before they can see the details of your vehicle. Using them correctly—at dusk, at dawn, in bad weather, and whenever you park in the dark—is a sign of a competent, responsible, and courteous driver.

Remember, your car’s lights are your voice in the dark. Use them wisely, use them correctly, and stay safe.

Do you have any other questions about car lights? Drop them in the comments below, and maybe Coach Wang will cover them next!

FAQs