Clearance Light Assembly

What Are Clearance Light Assemblies?

Clearance light assemblies are the small, colored marker lights mounted along the upper edges, sides, and rear of larger vehicles — most commonly trucks, semi-trailers, RVs, and tow vehicles. Their primary job is deceptively simple but critically important: they communicate a vehicle's overall width and height to other drivers, especially in low-visibility conditions like rain, fog, or night driving. Federal Motor Carrier Safety Administration (FMCSA) regulations require clearance lights on any vehicle wider than 80 inches, making them not just a convenience, but a legal necessity for commercial and heavy-duty vehicles.

Why Clearance Light Assemblies Matter

A burned-out or damaged clearance light is more than an inconvenience — it can result in a failed DOT inspection, a costly roadside citation, or worse, a collision caused by a driver who couldn't judge the width of your rig. These assemblies take a beating from road debris, weather, UV exposure, and vibration, which is why choosing a quality replacement matters. Modern clearance light assemblies are available in traditional incandescent and energy-efficient LED configurations, with LED units offering significantly longer service life and lower power draw — an important consideration for fleets and owner-operators alike.

What to Look for When Shopping Clearance Lights

• Incandescent vs. LED: LED assemblies last far longer and draw less current, but verify socket and lens compatibility with your application.
• Lens Color: Federal regulations specify amber for forward-facing and side clearance lights, and red for rear-facing units. Always match the correct lens color for your position.
• Mounting Style: Surface-mount, grommet-mount, and flange-mount styles are common — confirm your existing cutout dimensions before ordering.
• Ingress Protection Rating: Look for weatherproof or waterproof ratings to ensure the assembly holds up in harsh environments.
• DOT/SAE Compliance: Ensure any replacement carries the appropriate DOT and SAE certifications required for on-road use.

Top Brands in Clearance Light Assemblies

Grote is one of the most recognized names in commercial vehicle lighting, with decades of engineering experience designing heavy-duty clearance and marker lights built to withstand the rigors of over-the-road trucking. Their assemblies are widely trusted by fleets and independent operators for reliability and DOT compliance.

Dorman brings its well-known OE-replacement philosophy to clearance light assemblies, offering direct-fit solutions engineered to match the original specifications of specific vehicle makes and models. Dorman is a go-to choice for technicians who want a hassle-free, plug-and-play replacement.

Peterson Fluid Systems (also known simply as Peterson Manufacturing) has a long heritage in vehicle lighting and accessories, producing durable marker and clearance lights respected across the trucking and trailer industries for their straightforward, dependable designs.

Optronics offers one of the broadest selections of clearance light assemblies in the category, covering everything from standard incandescent units to modern LED upgrades for trailers, trucks, and specialty vehicles. Their wide product range makes it easy to find an exact or compatible fit across a large variety of applications.