A flat rack hauling a transformer wider than the chassis itself doesn't belong on I-95 without flags, signage, and lights bolted down first. Florida Highway Patrol's commercial vehicle unit checks oversize moves on the Palmetto and the Dolphin Expressway, and a missing piece of gear parks that load on the shoulder until someone fixes it.
What Counts as an Oversize Load
Florida sets legal dimensions for a truck and trailer running without a permit. Cross any one of those limits and the move needs an FDOT oversize permit before it touches a public road. Most drayage runs never get near these numbers. Out-of-gauge cargo on a flat rack, construction equipment on a lowboy, or wind turbine sections moving inland from Port Everglades do.
A container that fits inside those numbers moves as a standard load. A flat rack carrying something that sticks out past the rail, or cargo tall enough to clear a chassis by more than a foot, usually doesn't. Dispatch checks the actual measurements against the permit before the truck leaves the yard, not after a trooper asks for paperwork on I-95.
The Sign Isn't Optional
Any load over 10 feet wide, 14 feet high, or past the legal length needs an "OVERSIZE LOAD" sign mounted front and rear. FDOT specifies the sign itself: 7 feet long, 18 inches high, black letters at least 12 inches tall with a 1.5-inch stroke, on a yellow background. A faded or undersized sign counts as no sign at all during a roadside check.
The sign has to sit where it's visible from directly ahead and directly behind, not tucked behind a headache rack or blocked by the load itself. Drivers running regular oversize moves keep a spare mounted and ready rather than borrowing one off a parked trailer at the yard.
Flags: Four Corners, No Exceptions
Flags mark the edges of a load that extend past where a driver behind expects the truck to end. Florida requires red or fluorescent orange flags, at least 18 inches square, clean enough to actually be seen, on every oversize move.
- One flag on each of the four corners of an over-width load
- A flag at the extreme end of any overhang, projection, or protrusion
- Replacement flags on hand — highway wind off the Palmetto shreds a cheap flag inside a few runs
- Flags mounted so they wave freely, not folded flat against the load where a following driver can't see them
A driver who loses a corner flag somewhere on the Dolphin Expressway and keeps driving is running an unmarked load for however many miles are left on the route. FHP doesn't wait for a crash to write that citation.
When Amber Lights Join the Flags
Width past 12 feet, height past 14'6", or length past 85 feet adds amber warning lights to the requirement list. FDOT wants two 360-degree amber lights, one mounted on the tractor and one at the rear of the load, flashing the entire time the load is in motion.
Escort Vehicles by the Numbers
Escort requirements scale directly with how far a load crosses the legal dimensions, and Florida's thresholds aren't flexible.
The escort vehicle carries its own equipment list: amber warning lights, an oversize load sign, flags, and identification placards with the company name and phone number on both doors. A pilot car running without that gear doesn't satisfy the escort requirement, it just adds a second vehicle for FHP to pull over.
What a Driver Carries in the Cab
Permits and placards cover the legal minimum. Drivers who run oversize moves regularly through Miami keep a few more things within reach before they ever clear the yard gate.
- A tape measure to confirm actual load width and height match what the permit states, not what the paperwork from the shipper assumed
- A printed copy of the permit and route survey, since a phone screen doesn't work well for a trooper checking it at a truck stop in the rain
- Spare flags and a spare amber bulb or battery pack
- Rated tie-down chains and binders sized for the actual cargo weight, not whatever was already on the trailer
- A known list of low-clearance spots on the route — overpasses on SR 836, the Le Jeune Road underpass, and the tight turn off Dodge Island onto the MacArthur Causeway catch drivers who haven't run the route before
What a Trooper Does With Missing Gear
FHP's commercial vehicle enforcement unit works oversize checks on I-95, the Palmetto, and the approaches into Port Miami. A missing flag or a dead amber light gets the load parked on the shoulder until the gap is fixed, which on a tight appointment window turns a routine move into a missed delivery and a rescheduled warehouse slot.
Repeat equipment violations put the permit itself at risk. A pulled permit stops the move completely until a new one clears, and that delay lands on whoever's paying for the truck sitting idle. At One A Trucks, our dispatch team checks escort requirements, signage, and lighting against FDOT's dimension tables before a load leaves the yard, so the gear gets caught in the parking lot and not on the shoulder of I-95.