Indiana trailer laws and regulations
Indiana trailer brake threshold, dimension limits, registration fees, and the requirements that change with trailer weight and use.
Indiana requires brakes on any trailer or semi-trailer with a gross weight of 3,000 lb or more, and the brakes must be operable from the tow vehicle cab. Max trailer length is 40 ft, total combination 65 ft, width 102 in, height 13 ft 6 in. Trailers under 3,000 lb empty can get a permanent registration plate for $82. Indiana allows triple-towing of up to two units totaling 65 ft.
Quick reference
| Requirement | Indiana rule | Statute |
|---|---|---|
| Brake threshold | 3,000 lb gross weight | Indiana Code 9-19-3-1 |
| Brakes operable from cab | Required when brakes required | Indiana Code 9-19-3-1 |
| Max trailer length | 40 ft | Indiana Code 9-20-3-5 |
| Max combination length | 65 ft (3+ vehicles or w/load) | Indiana Code 9-20-3-5 |
| Max width | 102 in | Indiana Code 9-20-3-1 |
| Max height | 13 ft 6 in | Indiana Code 9-20-3-2 |
| Safety chains | Double safety chain required | Indiana Code 9-19-7-2 |
| Triple towing | Allowed (no more than 2 vehicles tied together) | Indiana Code 9-21-19 |
| Load overhang | 3 ft front, 4 ft rear | Indiana Code 9-20-3 |
Registration
Indiana provides a permanent registration plate for trailers under 3,000 lb gross weight, with a one-time fee of $82. Heavier trailers register annually with fees scaled to weight.
Trailers require a title in Indiana with two narrow exceptions:
- Very small trailers (typically under 1,000 lb) used off-highway only.
- Farm trailers operated only on farm property.
If the trailer ever uses a public road, it should have a title and registration.
Brake requirements
Indiana Code 9-19-3-1 requires:
- Trailers over 3,000 lb gross weight (loaded) must have brakes adequate to stop and hold the trailer.
- The brakes must be operable from the tow vehicle’s cab.
- Brakes must be synchronized so that the trailer brakes engage with the tow vehicle’s service brakes.
Indiana does not explicitly require a breakaway brake in the basic statute, but federal regulations and most insurance carriers do for trailers over 3,000 lb GVW. Building it in is essentially mandatory in practice.
Dimensions and combinations
- Max trailer length: 40 ft.
- Max combination length: 65 ft for three or more vehicles or a vehicle plus load.
- Width: 102 in. Loads wider than 102 in need an oversize permit from INDOT.
- Height: 13 ft 6 in.
- Load overhang: up to 3 ft beyond the front of the vehicle, 4 ft beyond the rear.
Indiana allows two vehicles tied together (one tow vehicle plus one trailer or one trailer pulling another), but not three vehicles in a row. The triple-tow setups legal in Wyoming or Idaho are not legal in Indiana.
Hitch and safety chain rules
Indiana Code 9-19-7-2 requires a double safety chain on all trailers, crossed under the tongue and attached to the tow vehicle. Hitch type is not specified; coupler-and-ball, gooseneck, fifth wheel, and pintle are all acceptable as long as they’re rated for the load.
Trailer lighting
Trailers in Indiana must have:
- At least one red tail lamp visible from 500 ft.
- Two white license plate illumination lamps so the plate is readable from 50 ft at night.
- Tail lamps mounted between 20 and 72 in above the road surface.
- Brake lights and turn signals synchronized with the tow vehicle.
Trailers over 80 in wide need clearance lamps and side markers per FMVSS 108 (federal lighting standards adopted by Indiana).
Speed limits
Indiana does not specify a separate towing speed limit. Posted limits apply. Most Indiana interstates are 70 mph, with some segments at 65. Commercial trucks (and some heavy passenger combinations) may be capped at 65 mph by signage on specific routes.
Mirror rules
Indiana Code 9-19-2 requires drivers to have rear-view capability of at least 200 ft. If the trailer or load blocks the interior mirror, exterior mirrors (or tow mirror extensions) are needed.
Riding in trailers
Riding in a trailer while it’s being towed on public roads is prohibited in Indiana. Fifth-wheel campers and slide-in truck campers are not trailers in this sense.
Penalties
Most trailer law violations in Indiana are infractions with fines around $35 to $150 plus court costs. Operating an over-dimension load without a permit can result in fines plus impoundment of the trailer at a weigh station.
Practical notes
Indiana’s 3,000 lb threshold for brakes matches many neighboring states (Ohio, Michigan, Kentucky’s recommendation though not statute). If you’re towing 5,000 lb plus, you need brakes throughout the region.
The 65 ft combination length is among the more generous in the eastern Midwest but still tighter than the 75 ft western standard. Long fifth-wheel RV setups should check route compliance.
The double-chain requirement is stricter than the single-chain default in some neighboring states (Kentucky, Michigan). If your trailer came with one chain, add a second before towing in Indiana.