Doubles & Triples: States Where They're Allowed
While standard doubles (wiggle wagons) are allowed on Interstate highways in all 50 states, triples and turnpike doubles are restricted to specific states and routes. This guide covers the state-by-state rules for multi-trailer combinations, weight limits, route restrictions, permit requirements, and what T-endorsed drivers need to know before crossing state lines.
O Trucking Editorial Team
Trucking Industry Experts
Fact-Checked by O Trucking Dispatch Team
5+ years managing multi-state freight operations including doubles and triples routes
This article was written by the O Trucking editorial team with 9+ years of combined trucking industry experience. Learn more about us.
O TruckingDoubles & Triples: States Where They
Federal Law: The STAA Baseline
The Surface Transportation Assistance Act (STAA) of 1982 established the federal baseline for multi-trailer operations. This law requires all states to allow:
Twin 28-foot trailers on the National Network (Interstate highways and designated federal-aid primary highways). Maximum 80,000 lbs GVW. No state can ban standard doubles on these routes.
Reasonable access from the National Network to terminals, service facilities, and food/fuel/rest stops within a reasonable distance of the highway (typically defined as the shortest practical route).
CDL T endorsement holders to operate these combinations. The federal Doubles/Triples endorsement is valid in all states.
Beyond this federal baseline, states have significant authority to allow or restrict larger multi-trailer combinations on state highways. This is why the rules vary dramatically between states.
Standard Doubles Are Legal Nationwide on Interstates
States That Allow Triple Trailers
Triple trailer combinations (three 28-foot pups) are restricted to specific states and routes. Here are the states that allow triples as of 2026:
| State | Max GVW | Route Restrictions |
|---|---|---|
| Arizona | 129,000 lbs | Designated Interstate routes |
| Colorado | 110,000 lbs | Designated routes; some mountain passes excluded |
| Idaho | 105,500 lbs | Designated Interstate and state routes |
| Indiana | 127,400 lbs | Indiana Toll Road (I-80/I-90) only |
| Kansas | 120,000 lbs | Kansas Turnpike and designated Interstates |
| Montana | 131,060 lbs | Designated routes; seasonal restrictions |
| Nebraska | 105,500 lbs | Designated Interstate routes |
| Nevada | 129,000 lbs | Most Interstate routes |
| North Dakota | 105,500 lbs | Designated Interstate routes |
| Ohio | 90,000 lbs | Ohio Turnpike (I-80/I-90) only |
| Oklahoma | 90,000 lbs | Designated turnpike and Interstate routes |
| Oregon | 105,500 lbs | Designated routes; permit required |
| South Dakota | 129,000 lbs | Designated Interstate routes |
| Utah | 129,000 lbs | Designated Interstate and state routes |
| Wyoming | 117,000 lbs | Designated Interstate routes |
Turnpike Doubles States
Turnpike doubles consist of two full-size 48-53 foot trailers, creating combinations exceeding 100 feet in length. These are the most restricted multi-trailer configurations and require special permits in the limited states that allow them:
Florida — Turnpike doubles allowed on the Florida Turnpike system and designated Interstate routes. Maximum 80,000 lbs without overweight permit, up to 105,500 lbs with permit.
Indiana — Turnpike doubles on the Indiana Toll Road. Maximum 127,400 lbs with permit. Restricted to toll road only.
New York — Turnpike doubles on the New York State Thruway. Maximum 143,000 lbs with permit. Some of the heaviest legal loads in the country.
Ohio — Turnpike doubles on the Ohio Turnpike (I-80/I-90). Maximum 127,400 lbs with permit.
Massachusetts — Turnpike doubles on the Massachusetts Turnpike. Maximum 127,400 lbs with permit.
Rocky Mountain Doubles
Rocky Mountain doubles combine one full-size 48-foot trailer with one 28-foot pup trailer. These are allowed in several western states:
Common in: Arizona, Colorado, Idaho, Montana, Nevada, Oregon, Utah, Washington, and Wyoming. Weight limits range from 105,500 to 129,000 lbs depending on the state.
Key advantage: A Rocky Mountain double carries more freight than standard doubles while being more maneuverable than turnpike doubles. The shorter rear trailer tracks better in turns than a second full-size trailer.
Permit requirements: Most states require special overweight/oversize permits. Some carriers maintain annual blanket permits for regular routes. See our doubles and triples guide for dimensions.
The Freeze on Longer Combination Vehicles (LCVs)
Common State Restrictions
Even in states that allow multi-trailer combinations, there are typically additional restrictions that drivers must follow:
Route restrictions — Most states limit triples and turnpike doubles to specific Interstate highways and turnpikes. Deviating from designated routes can result in overweight/oversize violations.
Time-of-day restrictions — Some states prohibit triples during rush hours or require daytime-only operation. Montana and some other mountain states restrict LCVs during winter weather conditions.
Weather restrictions — Many states can shut down LCV operations during snow, ice, high winds, or reduced visibility. Dispatchers and drivers must monitor weather-related LCV restrictions in real time.
Speed limits — Some states impose lower speed limits for multi-trailer combinations, typically 55-60 mph even where standard trucks can go 65-70 mph.
Driver experience requirements — Some states require LCV drivers to have minimum experience (often 1-2 years of CDL experience) beyond just holding the T endorsement.
Getting Permits for LCVs
The permit process for longer combination vehicles varies significantly by state. Here is what drivers and carriers should know:
Annual Blanket Permits
Most LTL carriers obtain annual blanket permits that cover all their equipment on approved routes. These are typically arranged by the carrier's permit department, and individual drivers simply carry a copy of the permit in the cab. Carriers like FedEx Freight and UPS Freight maintain permits in all states where they operate triples.
Per-Trip Permits
Some states require per-trip permits for LCV operations. These are more common for turnpike doubles and overweight configurations. Per-trip permits typically specify the route, dates, and weight limits. Your carrier's safety/compliance department handles these.
What Drivers Need in the Cab
When operating LCVs, drivers should carry: a copy of the state permit (blanket or per-trip), valid CDL with T endorsement, vehicle registration showing appropriate GVW ratings, and proof of insurance covering the LCV configuration. Some states require the permit to be displayed on the vehicle.
Your Carrier Handles Permits — But Know the Rules
Crossing State Lines with Multi-Trailer Combinations
One of the biggest challenges for multi-trailer operations is crossing from a state that allows your configuration into one that does not:
Triples to doubles — If you run triples from Utah to a non-triples state, you must drop the third trailer at a terminal near the border. LTL carriers locate terminals strategically for this purpose.
Overweight to standard — If you are running overweight in a state that allows it (e.g., 105,500 lbs in Idaho) and crossing into a state with an 80,000 lb limit, you must reduce weight before crossing the line.
Turnpike doubles to standard — Turnpike doubles must be separated when leaving the toll road system. The carrier's terminal or a designated staging area near the turnpike exit handles this transition.
Future of Multi-Trailer Regulations
The trucking industry has debated expanding multi-trailer operations for decades. Key points in the ongoing discussion:
- Twin 33-foot trailers — Industry groups have proposed allowing 33-foot pups instead of 28-foot pups nationwide. This would increase capacity by 18% per combination without increasing GVW or adding trailers. Safety groups have opposed this.
- Expanding triples states — The ISTEA freeze makes it difficult for new states to allow triples without federal legislation. Several bills have been introduced in Congress but none have passed.
- Technology requirements — Some proposals tie expanded LCV operations to mandatory safety technology such as electronic stability control, automatic emergency braking, and advanced driver assistance systems.
- Environmental benefits — Proponents argue that larger combinations reduce emissions per ton-mile by consolidating freight into fewer trips, reducing the number of trucks needed on highways.
Multi-Trailer State Rules FAQ
Common questions about which states allow doubles, triples, and turnpike doubles
What states allow triple trailers?
As of 2026, approximately 20 states allow triple trailer combinations on designated routes. States that commonly allow triples include: Arizona, Colorado, Idaho, Indiana, Kansas, Montana, Nebraska, Nevada, North Dakota, Ohio, Oklahoma, Oregon, South Dakota, Utah, and Wyoming. Most of these states restrict triples to specific Interstate highways and turnpikes, require special permits, and impose time-of-day or weather restrictions. The specific routes and requirements vary significantly by state, so drivers must check current regulations before running triples in any state.
Are doubles allowed in all 50 states?
Standard doubles (twin 28-foot pup trailers) are allowed on the National Network of highways in all 50 states. The Surface Transportation Assistance Act (STAA) of 1982 requires all states to allow twin 28-foot trailers on Interstate highways and other designated routes. However, states can restrict doubles on non-Interstate roads, and some states have more restrictive weight limits or require permits for off-Interstate operation. Turnpike doubles (two full-size 48-53 foot trailers) are only allowed in a handful of states with special permits.
What is the weight limit for doubles?
The federal weight limit for standard doubles on Interstate highways is 80,000 lbs gross vehicle weight (GVW), the same as a single 53-foot trailer combination. Some states allow higher weights on state highways with permits. Turnpike doubles can weigh 105,500 to 147,000 lbs depending on the state and route. Rocky Mountain doubles (one 48-foot trailer plus one 28-foot pup) typically operate at 105,500 to 129,000 lbs with state permits. Individual state bridge formulas may further restrict weight based on axle spacing.
Do I need a special permit for doubles?
Standard doubles (twin 28-foot pups) on Interstate highways generally do not require a special permit beyond the Doubles/Triples (T) endorsement on your CDL. However, operating doubles on non-Interstate state highways, running turnpike doubles, or operating triples always requires additional state permits. Permit requirements vary widely: some states issue annual blanket permits for LTL carriers, others require per-trip permits, and some restrict permitted operations to specific routes, times, or weather conditions.
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