Maryland OSOW permits

Permits valid for five travel days. Must have a permit prior to entering the state.

Maryland permitting system:!

Contact phone number: 1-410-582-5734


One-half hour before sunrise to one-half hour after sunset, Monday through Friday and Saturday until Noon (see Restricted Travel, below, for some exceptions).


No movements across any toll facilities allowed from noon Friday until 9:00 A.M. Monday. This includes the I-95 toll facility over the Susquehanna River between Baltimore and the Delaware line. Over 12' wide or over 92,000 pounds can only travel from 9:00 A.M. to 3:30 P.M. (and Saturday until Noon) when on the Capital Beltway I-495/I-95 and Baltimore Beltway I-695. If 14' wide or more, travel is only allowed from 9:00 A.M. to 3:30 P.M. (and Saturday until Noon on any highway. No travel on six major Holidays and Holiday weekends (check with the Permit Office).


Baltimore permits for the predefined route into or out of Dundalk Marine Terminal have now included with the Maryland state permit provided the dimensions are under 120,000 pounds, 12' wide, 14'6" high, and 85' long. Loads with other Baltimore destinations or origins, or loads exceeding these dimensions have to be ordered separately from Baltimore City, which is usually slow with a 24-hour (minimum) turn-around time.


Width: 8'6" Interstate & designated highways, 8' all other roads.

Height: 13'6" (over 13'6" not permitted on flat-bed).

Length: 53' semi-trailer on Interstate and designated highways, 48' trailer all other roads. Trailers over 48' are not to exceed 41' kingpin to the center of rear tandem axles, and not more than 4' set back from front of the trailer to kingpin.

Overhang: 3' front, 6' rear

Weight: 80,000 Gross Single – 20,000 Tandem – 34,000 Tridem – 42,500


Width: 16'

Height: 16' (overheight cannot be permitted on a flatbed). Over 14'6" now requires a route survey.

Length: 120'

Weight: 120,000 (non-Interstate) to 150,000 (Interstate)

Single – 27,000 Tandem – 52,000 Tridem – 63,000

Loads exceeding these dimensions are treated as super loads. Over 120,000 pounds gross on any non-Interstate routes is a superload.


Width: Over 13' – 1 escort; 14' or more – 2 escorts; at 16' or more – Police escort.

Montgomery and Prince George Counties: loads over 12' wide on 2-lane undivided – 2 escorts

Length: Over 85' – 1 escort; 140' or more – 2 escorts.

Height: 14'6" or more – 1 escort with a high pole (some routes may have other requirements), and a route survey must accompany the application.

Weight: Over 120,000 pounds – 1 civilian escort, and Police escort is required on the entire route if any part of the route is on non-Interstate highways; over 130,000 pounds - Police escort is required even on Interstate-only routes.


Construction equipment can have a blade or bucket attached up to 12' wide. The detached blade and dozer cannot be hauled on the same load if it is overweight. The blade has to be hauled separately.


"Oversize Load" or "Wide Load" signs are required if the vehicle and load exceeds 9' in width.

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