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Stop/Tail/Turn Lights for Semi-Trucks, Trailers, and Commercial Vehicles
DOT-compliant stop, tail, and turn lights for semi-trucks, trailers, and commercial vehicles. LED and incandescent options are available across a full range of housing styles — round, oval, rectangular, and light bar — in grommet-mount, flange-mount, and surface-mount configurations. Most lights in this category are sealed units. A small number of incandescent models are serviceable.
Beyond standard STT function, this category includes combination lights with integrated backup lamps and license plate lights for simplified trailer tail light installations, as well as units combining STT with backup and amber strobe functions for tow trucks, plow trucks, utility vehicles, dump trucks, and similar vocational and municipal applications. Steel light boxes with pre-mounted round STT and side marker lights are also available for straightforward installation on older trailers and box trucks.
Most lights are 12V, with a selection of 24V and multi-voltage units for mixed-fleet applications. Brands include Automann, Betts, Buyers Products, Grote, Peterson, Pro LED, and Truck-Lite.
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Frequently Asked Stop, Tail, and Turn Light Questions:
What stop, tail, and turn lights are required on a semi-trailer?
Federal regulations under FMVSS 108 and 49 CFR 393 require semi-trailers to have two red stop lamps, two red tail lamps, and two turn signals at the rear. Turn signals may be red or amber. All required lamps must be visible from at least 500 feet. Trailers over 80 inches wide require additional stop and turn signal lamps mounted as far apart as practicable.
What is the difference between a stop lamp and a tail lamp?
A tail lamp provides continuous red illumination whenever the vehicle's lights are on, marking the rear of the vehicle in low-light conditions. A stop lamp activates when the brakes are applied and must be brighter than the tail lamp. On most commercial vehicles these functions are combined in a single stop/tail/turn housing.
What are combination STT lights with backup and license plate functions?
These are multi-function tail light assemblies that combine stop, tail, and turn lighting with an integrated backup lamp and license plate light in a single housing. They simplify trailer tail light installation by consolidating multiple required functions into one unit, reducing wiring connections and mounting points.
What are STT lights with amber strobe functions used for?
Stop/tail/turn lights with integrated amber strobe functions are designed for vocational and municipal vehicles that require both standard rear lighting and high-visibility warning capability — tow trucks, plow trucks, utility vehicles, dump trucks, garbage trucks, and similar applications. The amber strobe operates independently of the STT circuit.
What are steel light boxes used for?
Steel light boxes are mounting assemblies that include pre-installed round grommet-mount stop/tail/turn lights and side marker lights in a ready-to-bolt housing. They are designed for straightforward installation on older trailers, box trucks, and other commercial vehicles where existing light mounts are damaged, missing, or non-standard.
Can I replace incandescent stop/tail/turn lights with LED?
In most cases yes — as long as the replacement LED lamp is DOT-certified for stop, tail, and turn functions and fits the existing mounting configuration. Grommet-mount round and oval LED units are widely available as direct replacements for incandescent units. Verify the connector type before ordering to confirm wiring compatibility.