Fact #411: February 13, 2006 States that Allow Longer Combination Vehicles
Longer Combination Vehicles (LCV) allow trucks to haul more in a single load. There are three common types: Rocky Mountain Doubles (RMD), Turnpike Doubles (TPD), and Triple Trailers (TT). These longer combination vehicles are primarily allowed in Western States but are also permitted on some turnpikes.

Supporting Information
| State | Types of LCVs permitted by the State | Types of LCVs permitted by the Turnpike Authority |
|---|---|---|
| Alabama | None | |
| Alaska | Turnpike doubles & Rocky Mountain doubles | |
| Arizona | None | |
| Arkansas | None | |
| California | None | |
| Colorado | ALL LCV types | |
| Connecticut | None | |
| Delaware | None | |
| District of Columbia | None | |
| Florida | Turnpike doubles & Rocky Mountain doubles | |
| Georgia | None | |
| Hawaii | None | |
| Idaho | ALL LCV types | |
| Illinois | None | |
| Indiana | ALL LCV types | |
| Iowa | None | |
| Kansas | ALL LCV types | |
| Kentucky | None | |
| Louisiana | None | |
| Maine | None | |
| Maryland | None | |
| Massachusetts | Turnpike doubles & Rocky Mountain doubles | |
| Michigan | None | |
| Minnesota | None | |
| Mississippi | None | |
| Missouri | None | |
| Montana | ALL LCV types | |
| Nebraska | ALL LCV types | |
| Nevada | ALL LCV types | |
| New Hampshire | None | |
| New Jersey | None | |
| New Mexico | None | |
| New York | Turnpike doubles & Rocky Mountain doubles | |
| North Carolina | None | |
| North Dakota | ALL LCV types | |
| Ohio | ALL LCV types | |
| Oklahoma | ALL LCV types | |
| Oregon | Triple Trailers & Rocky Mountain doubles | |
| Pennsylvania | None | |
| Rhode Island | None | |
| South Carolina | None | |
| South Dakota | ALL LCV types | |
| Tennessee | None | |
| Texas | None | |
| Utah | ALL LCV types | |
| Vermont | None | |
| Virginia | None | |
| Washington | Rocky Mountain doubles | |
| West Virginia | None | |
| Wisconsin | None | |
| Wyoming | Rocky Mountain doubles |