Oversize Load Flags, Lights & Banners
Last reviewed September 2026
The yellow banner and red flags on a wide load are not decoration; they are a legal marking system that tells every other driver, in a glance, that the vehicle ahead breaks the normal envelope. Marking rules differ in detail between jurisdictions but follow one shared grammar across North America.
The banner
Loads over legal width display a high-visibility banner, black lettering on yellow, reading OVERSIZE LOAD or a local equivalent, on the front of the power unit and the rear of the load. Jurisdictions prescribe minimum letter heights and visibility distances, and night moves typically require reflective-grade material. The banner comes down or gets covered when the truck runs empty and legal, because false marking is its own offense.
Flags at the extremities
Bright red or orange flags, commonly around 18 inches square and clean enough to actually be seen, mark the widest points of the load and any overhang. A projecting rear overhang carries its own flag by day and a red lamp by night nearly everywhere. Flags answer a simple question for the driver behind: exactly how wide is the thing I am about to pass.
Lights and beacons
Rotating or flashing amber beacons on the power unit, and often on the escorts, mark the convoy as a slow, wide anomaly in traffic. Night moves, where allowed at all, add marker lamps along the load's extremities so its true outline reads in headlights. Jurisdictions that permit night travel usually pair it with stricter lighting specs and lower dimension caps.
Whose job the marking is
Marking is the carrier's responsibility and part of the pre-trip: banners mounted, flags at the corners, beacons working, before the wheels turn. It is also part of what a professional escort checks at the staging point. As a shipper you will never buy a flag, but you will notice a professional operation by how crisply it is marked.
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Get an instant quote →Common questions
Why do some loads show flags but no banner?▾
Marking scales with the exceedance: a slightly-over load may need flags only, while banner, flags, and beacons stack on as width and length grow. Each jurisdiction sets the stack.
Do escorts carry their own signs?▾
Yes. Pilot cars run their own OVERSIZE LOAD signage, beacons, and flags, so the convoy reads as one marked unit from either direction.
Can oversize loads move at night?▾
Some jurisdictions allow night movement for moderate dimensions with enhanced lighting, often on divided highways only; others restrict oversize movement to daylight. It is a jurisdiction rule dispatch plans around.
This guide is provided free, for general information, so shippers can see how oversize and overweight moves work. It is not legal advice and not a permit determination. Limits, escort bands, fees, and seasonal restrictions change regularly; before relying on any figure, verify it with the jurisdiction's transportation department or permit office, or a licensed permit service. When you book with LoadLoom, our dispatch desk and your assigned carrier confirm the current rules for your exact load and route; that confirmation, not this page, governs your shipment. Spot an error? Email customercare@loadloom.com.