Florida Legal Size Limits (Without Permit)
Width
- Max: 8 ft 6 in (102 inches)
Height
- Max: 13 ft 6 in
- Some older routes may have lower clearances—always verify your route
Length
- Semi-truck (tractor + trailer): typically up to 48–53 ft trailer
- Overall length: generally no strict limit on designated highways if trailer length is legal
- Kingpin-to-rear axle: usually 41 ft max (important for compliance)
Florida Legal Weight Limits (Without Permit)
Gross Vehicle Weight
- Max: 80,000 lbs (standard federal limit)
Axle Limits
- Single axle: 20,000 lbs
- Tandem axle: 34,000 lbs
Bridge Formula
Florida uses the federal bridge formula to determine allowable weight based on axle spacing:
W=500(LNN−1+12N+36)W = 500\left(\frac{LN}{N-1} + 12N + 36\right)W=500(N−1LN​+12N+36)
Where:
- W = maximum weight (lbs)
- L = distance between axles (feet)
- N = number of axles
This formula prevents excessive stress on bridges and roads.
When You Need a Permit in Florida
You must obtain a permit from the Florida Department of Transportation if your load exceeds:
- 8'6" wide
- 13'6" high
- Legal length limits
- 80,000 lbs gross weight
Important Notes
- Florida is strict about axle spacing and distribution, not just total weight
- Overweight loads may still be denied if they exceed bridge limits
- Some local roads and bridges have lower posted limits
- Ports and construction zones often have special restrictions
Pro Tip
Even if you’re under 80,000 lbs, you can still be illegal if:
- Your axle weights are uneven
- Your spacing doesn’t meet the bridge formula