Clearance lights are small marker lights that show the width and height of your truck to other drivers

Clearance lights are small amber or red lights mounted on the front, sides, and rear of a truck to mark its outer edges. They tell other drivers how wide and how tall your vehicle is, especially in low light or bad weather. On the front, they're usually amber; on the back and sides, they can be amber or red depending on the truck's size and what the law requires in your state.

These lights are different from brake lights or turn signals — they stay on whenever your headlights are on, not just when you're braking or turning. Their job is purely to outline your truck's shape so other vehicles know where your edges are and can pass or maneuver safely around you.

Key Takeaways

  • Clearance lights mark the width and height of your truck to prevent other drivers from hitting your sides or top.
  • Most states require clearance lights on trucks over a certain width or height, though the exact measurements vary by state.
  • Front clearance lights are usually amber, while rear and side lights are often red or amber depending on your truck's configuration.
  • Clearance lights stay on whenever your headlights are on, and a burned-out bulb can result in a traffic citation in many states.

Which trucks are required to have clearance lights

The requirement depends on your truck's size. Most states require clearance lights on vehicles that are wider than 80 inches or taller than 13 feet 6 inches. Some states set different thresholds, and a few have no state-level requirement but follow federal motor carrier safety standards if your truck crosses state lines or carries commercial cargo.

If you drive a pickup truck for personal use, you may not be required to have clearance lights at all — the rule usually applies to larger commercial trucks, box trucks, and flatbeds. Check your state's vehicle code or contact your state's Department of Motor Vehicles to confirm what applies to your specific truck.

Where clearance lights are mounted on a truck

Front clearance lights sit on the top corners of the cab, usually amber. They're positioned to show the widest point of the front of your truck. Side clearance lights run along the length of the truck bed or cargo area, also typically amber, and mark how far out the truck extends on each side.

Rear clearance lights are mounted on the back corners of the truck bed or cargo area and are usually red. Some trucks also have a center-mounted red light on the back. The exact placement depends on your truck's width and height — taller or wider trucks may have more lights to fully outline their shape.

When clearance lights turn on and off

Clearance lights are wired to your truck's headlight circuit, so they turn on and off with your headlights. When you turn on your low beams or high beams, the clearance lights come on automatically. When you turn off your headlights, the clearance lights go off too.

This means clearance lights are on during dawn, dusk, rain, fog, and any other condition where you'd use your headlights. They're not motion-activated or tied to your brake pedal — they straightforward stay lit as long as your headlights are on.

What happens if a clearance light burns out

A burned-out clearance light bulb is a safety issue and a legal one. In most states, driving with a broken clearance light can result in a traffic citation, especially if you're pulled over by a commercial vehicle inspector or during a roadside safety check. The fine varies by state but is usually between $50 and $200.

Beyond the ticket, a missing light reduces visibility of your truck's edges, which increases the risk of another driver clipping your side or misjudging your height when passing under a low structure. If you notice a clearance light is out, replace the bulb as soon as you can. Most clearance light bulbs are inexpensive and straightforward to swap yourself, though you can also take your truck to a mechanic or truck service center.

How to check if your clearance lights are working

The simplest way is to turn on your headlights and walk around your truck in daylight or have someone watch from a distance. Look at each corner and side to confirm the amber and red lights are glowing. If you're alone, park near a reflective surface like a garage door or storefront window and look for the reflection of the lights.

If any light looks dim or isn't on at all, note which one and check the bulb. Most clearance light bulbs are accessible from inside the truck bed or from behind the light fixture — your truck's manual will show you where. If the bulb is intact but the light still won't come on, the wiring or socket may be damaged, and you'll need a mechanic to diagnose it.

Clearance lights vs. other truck lights

It's straightforward to confuse clearance lights with other marker lights on a truck. Here's the difference: marker lights are small lights that outline the truck's shape and stay on with the headlights. Clearance lights are a type of marker light specifically required on wide or tall vehicles. Reflectors are passive — they don't produce light but bounce light from other vehicles back at them. Brake lights only come on when you press the brake pedal. Turn signals only flash when you're turning.

Clearance lights are always on (when headlights are on), always steady (not flashing), and always amber or red. If you see a light on your truck that behaves differently, it's probably serving a different purpose.

Frequently Asked Questions

Do I need clearance lights on my pickup truck?

Most personal-use pickup trucks don't require clearance lights because they fall under the width and height thresholds. If your pickup is a standard cab or crew cab, you almost certainly don't need them. Check your state's vehicle code or contact your DMV if your truck is unusually wide or tall, or if you're unsure.

Can I drive at night without clearance lights if they're burned out?

If your truck is required to have clearance lights and one is burned out, you shouldn't drive it at night or in low light. You risk a citation and, more importantly, you reduce the visibility of your truck's edges to other drivers. Replace the bulb before driving in conditions where you'd use your headlights.

Are clearance lights the same as side marker lights?

Clearance lights are a type of marker light. All clearance lights are marker lights, but not all marker lights are clearance lights. Marker lights are the broader category; clearance lights specifically mark the width and height of large vehicles. Your truck may have both, depending on its size.

What color should clearance lights be?

Front clearance lights are amber. Rear and side clearance lights are usually red, though some configurations use amber on the sides. The exact color requirement depends on your state and your truck's size. Your truck's manual or your state's vehicle code will specify what's required for your vehicle.

Do clearance lights drain my battery if left on?

Clearance lights use very little power — they're small bulbs designed to run continuously when headlights are on. They won't drain your battery any faster than your headlights would. If your battery is draining unusually fast, the problem is likely something else, not the clearance lights.