How to read a Wyoming oversize permit
Wyoming oversize and overweight permits are handled by the Wyoming Highway Patrol's Commercial Carrier Section through its E-Permitting website, and a one-trip permit can also be obtained at the first Port of Entry. The state has not published a sample permit; the rules that matter most are daylight-only travel for most oversize loads and no escorted moves on six holidays and their weekends.
Issued by the Wyoming Highway Patrol, Commercial Carrier Section through Wyoming Highway Patrol Electronic Permitting System. Written from WHP's published rules; we haven't read a real Wyoming permit yet.
How to read the route
Wyoming has not published a sample permit, so the route layout is not known. WYDOT writes highways as Interstates (I-80, also printed I 80), US routes (US 287) and state routes (WY 789), and it places restrictions by milepost. Before you roll, check WYDOT's road closure notices for your highways: some spots are closed to loads over a set width or height.
Road names on Wyoming permits
| On the permit | Means |
|---|---|
| I-80 | Interstate 80 (WYDOT notices also print it as I 80 or I80) |
| US 287 | US Highway 287 |
| WY 789 | Wyoming state highway 789 |
| US 20 BUS | The business route of US 20 through a town |
| milepost 26.580 | A point along the highway, used to place closures and restrictions |
Where the route starts and ends
Not published. The Highway Patrol's page does not show how a permit writes its start and end points.
Conditions to watch for
Daylight only
Oversize loads move in daylight only. The night exceptions, which must be legal height, permitted, signed and lighted, are: a single unit over 60 ft but under 75 ft; a combination under 100 ft with a single unit over 60 ft; and loads up to 10 ft wide on Interstates only. Source
“Daylight hours only except for the following, which must be legal height, properly permitted, signed, and lighted:”
Holidays
Moves that need escorts are not allowed on New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving or Christmas, or on those holiday weekends. Source
“Movements requiring escorts are not permitted on the following holidays or holiday weekends:”
Escorts on two-lane roads
On two-lane primary and secondary highways, escorts are required at 110 ft long or more, 14 ft wide or more, or when the load will cross the center line. Source
“Escorts are required on two-lane primary and secondary highways when the movement is 110' or greater in length,”
Escorts on Interstates and overhang
On Interstates and four-lane divided highways, escorts are required at 15 ft wide or more. A rear overhang of 25 ft or more needs an escort on any highway. Height escorts, and length escorts on Interstates, are up to the approving authority. Source
“Escorts are required on Interstate or four-lane divided highways for widths of 15' or greater.”
OVERSIZE LOAD signs
Signs front and rear must read OVERSIZE LOAD, yellow background, at least 60 in wide by 10 in high, with black letters at least 8 in high. Source
“The signs shall have a yellow background and be at least 60 inches wide by 10 inches high,”
Night lights
At night, over-length loads need a red lamp and red reflector on each corner of the load. Over-width loads need amber clearance lights on the front corners, red on the rear corners, plus a revolving amber light, an amber strobe or two flashing amber lights. Source
“Over length loads require a red lamp and red reflector on each corner of the load”
Easy to miss
- Holiday weekends, not just the day: escorted moves are barred on the whole holiday weekend for New Year's, Memorial Day, July 4, Labor Day, Thanksgiving and Christmas.
- The night exception for width is narrow: only loads up to 10 ft wide, only on Interstates, and only if legal height, permitted, signed and lighted.
- Spot restrictions change. WYDOT's road closure page posts oversize limits by milepost, for example 'Loads over 10 feet 6 inches wide must exit at Mile Post 3 (Harrison Drive)'.
Questions
Can I run an oversize load at night in Wyoming?
Usually not. Wyoming allows daylight hours only, except a few long single units and combinations, and loads up to 10 ft wide on Interstates, and those must be legal height, permitted, signed and lighted.
Can I move an oversize load on a holiday in Wyoming?
Not if your move needs escorts. Escorted moves are not permitted on New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving or Christmas, or on those holiday weekends.
Where do I get a Wyoming oversize permit?
From the Wyoming Highway Patrol's E-Permitting website, wydotpermits.wyo.gov. The Patrol also says a one-trip permit may be obtained at the first Port of Entry.
Sources
Your permit is the legal document; follow everything it says. Rules change; check WHP's site before you move.Last checked October 2026.