What Maryland charges for a single-trip OS/OW permit, the limits that trigger one, and the escort thresholds — read from the state’s own publication. This rule has been in effect since 2025-06-11; we last read the source on 2026-07-10.
Oversize permit
$30
One price for a single-trip permit, whatever the dimensions. A 9-foot-wide load and a 16-foot-wide load pay the same.
Overweight permit
From $5
Scales with weight — there is no single figure.
A load that is both oversize and overweight pays this fee only, not both.
+ $20 Permigo service fee per permit, state fees at cost.
Legal limits
Exceed any one of these in Maryland and you need a permit for this state.
Limit
Interstate
Width
8'6"
Height
13'6"
Length
55'0"
Gross weight
80,000 lbs
Single axle
20,000 lbs
Tandem axle
34,000 lbs
Tridem axle
42,500 lbs
Trailer length
53'0"
What the permit costs
Maryland prices a single-trip permit as flat rate. One price for a single-trip permit, whatever the dimensions. A 9-foot-wide load and a 16-foot-wide load pay the same.
Escort requirements
Thresholds by road class. Where two classes differ, the road you are actually on governs.
Multilane
Width
Requirement
Over 12'0"
Travel window appliesBeltway window: loads over 45 tons, 100'+ long, or 12'+ wide may use I-495/I-95 (Capital Beltway) and I-695/MD 695 (Baltimore Beltway) ONLY 9:00 a.m.–3:30 p.m. (COMAR 11.04.02.06B(2)).
Over 13'0"
1 rear escortMore than 13' wide: 1 escort — 'Behind an overwidth vehicle or load on a multilane highway; In front of an overwidth vehicle or load on a two-lane highway' (COMAR 11.04.04.02 verbatim; the v1 'no road-type flip' claim was wrong). EXCEPTION: manufactured-housing units take no escort until 14'. Escort ≤300 ft from the load (the 2008 manual's 200 ft is stale).
14'0" and over
1 front escort + 1 rear escort14' wide or more (incl. manufactured housing): front + rear escorts (COMAR 11.04.04.03) and movement 9:00 a.m.–3:30 p.m. ONLY statewide (11.04.02.06B(3)).
16'0" and over
1 police escort · superload16' wide or more: Maryland State Police escort (COMAR 11.04.04.06) + 48-hr MSP notice + SHA District Engineer approval + bond/contractual liability; ≥16'W is 'excessive size' — 2 working days advance application (11.04.03.01/.02).
Height
Requirement
14'6" and over
1 front escort · height pole14'6" high or more: a pole (height-clearance) vehicle is THE single required escort and precedes the load (COMAR 11.04.04.03 'pole vehicle required' + .04D(3) 'the pole vehicle shall precede the escorted vehicle')
Over 14'6"
route surveyOVER 14'6" high (14'7"+): height-clearance route-survey certification before issuance (fax 800-945-5416). A load at exactly 14'6" needs the pole escort but not the survey.
16'0" and over
superload permit16' high or more = excessive size (COMAR 11.04.03.01): 2 working days advance application; MSP at ≥16'H appears only in the stale 2008 manual — current COMAR police triggers are width/weight only
Length
Requirement
Over 85'0"
1 rear escortMore than 85' long: 1 escort — behind on multilane (COMAR 11.04.04.02), in front on two-lane roads (.04D single-escort flip).
100'0" and over
superload permit100' long or more = 'excessive size' (COMAR 11.04.03.01): 2 working days advance application, performance bond, and the 9:00–3:30 beltway window.Beltway window: loads over 45 tons, 100'+ long, or 12'+ wide may use I-495/I-95 (Capital Beltway) and I-695/MD 695 (Baltimore Beltway) ONLY 9:00 a.m.–3:30 p.m. (COMAR 11.04.02.06B(2)).
Over 120'0"
Conditions applyOver 120' long: SHA's 'Super Load' length label + 48-hr advance notice — NOT a permit maximum (the v1 'no permit >120'' claim was wrong; bands run live to 140'+).
140'0" and over
1 front escort + 1 rear escort140' long or more: front + rear escorts + SHA District Engineer approval (COMAR 11.04.04.03 — live law, not dead text).
Front overhang
Requirement
Over 3'0"
Marking requiredFront overhang max 3' legal (Transp. §24-105); overhangs carry an 18"-square reflective flag.
Rear overhang
Requirement
Over 6'0"
Marking requiredRear overhang max 6' legal for divisible loads (§24-105; 4' for auto/boat transporters); 18"-square reflective flag required.
Weight
Requirement
Over 90,000 lbs
Travel window appliesBeltway window: loads over 45 tons, 100'+ long, or 12'+ wide may use I-495/I-95 (Capital Beltway) and I-695/MD 695 (Baltimore Beltway) ONLY 9:00 a.m.–3:30 p.m. (COMAR 11.04.02.06B(2)).Over 45 tons: speed limited to 10 mph under the posted limit (COMAR 11.04.03.02).
Over 120,000 lbs
1 rear escortMore than 60 tons: 1 escort (position flips by road type) + 'excessive weight' tier — 10 business days advance application, 9:00–3:30 movement, bond, engineering review; combination loads up to 150,000 lb are allowed on Interstate routes only (manual); >27,000 lb on any axle is itself a superload trigger. The 2008 manual
150,000 lbs and over
1 police escort · route survey · superload75 tons or more: Maryland State Police escort (COMAR 11.04.04.06 prints 'in excess of 75 tons'; the SHA page prints '75 tons or more' — ≥150,000 kept as the safe encode; 65–75 t is MSP-discretionary). Superload process: engineering structural review ($8 × structures crossed; bridge-engineer escort $20/structure, $12 repeat; monitoring $200/day; reviewed permits valid ≤6 months); night window 8:00 p.m.–6:00 a.m. or days 9:00–3:30; >250 tons = 'massive weight', 30 business days advance.MDTA toll facilities: permit moves only during daylight between 9 a.m. MONDAY and 12 noon FRIDAY (weekend ban), ≥1-hr notice to MDTA Police 410-537-7911, far-right toll lane (COMAR 11.04.02.05). Facility bars: Baltimore Harbor Tunnel >8'W or >13'6"H; Fort McHenry Tunnel >11'W, >14'6"H, >85'L or 55 tons. Bay Bridge caps (route file 07/07/2026): 60 t / 15'W / 110'L / 15'4"H, >10'W takes a police escort across; wind: 40+ mph bars house trailers/empties, 55+ closes. The Francis Scott Key Bridge does not currently exist (collapsed 3/2024) — do not route on it.
2-lane
Width
Requirement
Over 12'0"
Travel window appliesBeltway window: loads over 45 tons, 100'+ long, or 12'+ wide may use I-495/I-95 (Capital Beltway) and I-695/MD 695 (Baltimore Beltway) ONLY 9:00 a.m.–3:30 p.m. (COMAR 11.04.02.06B(2)).
Over 13'0"
1 front escortMore than 13' wide: 1 escort — 'Behind an overwidth vehicle or load on a multilane highway; In front of an overwidth vehicle or load on a two-lane highway' (COMAR 11.04.04.02 verbatim; the v1 'no road-type flip' claim was wrong). EXCEPTION: manufactured-housing units take no escort until 14'. Escort ≤300 ft from the load (the 2008 manual's 200 ft is stale).
14'0" and over
1 front escort + 1 rear escort14' wide or more (incl. manufactured housing): front + rear escorts (COMAR 11.04.04.03) and movement 9:00 a.m.–3:30 p.m. ONLY statewide (11.04.02.06B(3)).
16'0" and over
1 police escort · superload16' wide or more: Maryland State Police escort (COMAR 11.04.04.06) + 48-hr MSP notice + SHA District Engineer approval + bond/contractual liability; ≥16'W is 'excessive size' — 2 working days advance application (11.04.03.01/.02).
Height
Requirement
14'6" and over
1 front escort · height pole14'6" high or more: a pole (height-clearance) vehicle is THE single required escort and precedes the load (COMAR 11.04.04.03 'pole vehicle required' + .04D(3) 'the pole vehicle shall precede the escorted vehicle')
Over 14'6"
route surveyOVER 14'6" high (14'7"+): height-clearance route-survey certification before issuance (fax 800-945-5416). A load at exactly 14'6" needs the pole escort but not the survey.
16'0" and over
superload permit16' high or more = excessive size (COMAR 11.04.03.01): 2 working days advance application; MSP at ≥16'H appears only in the stale 2008 manual — current COMAR police triggers are width/weight only
Length
Requirement
Over 85'0"
1 front escortMore than 85' long: 1 escort — behind on multilane (COMAR 11.04.04.02), in front on two-lane roads (.04D single-escort flip).
100'0" and over
superload permit100' long or more = 'excessive size' (COMAR 11.04.03.01): 2 working days advance application, performance bond, and the 9:00–3:30 beltway window.Beltway window: loads over 45 tons, 100'+ long, or 12'+ wide may use I-495/I-95 (Capital Beltway) and I-695/MD 695 (Baltimore Beltway) ONLY 9:00 a.m.–3:30 p.m. (COMAR 11.04.02.06B(2)).
Over 120'0"
Conditions applyOver 120' long: SHA's 'Super Load' length label + 48-hr advance notice — NOT a permit maximum (the v1 'no permit >120'' claim was wrong; bands run live to 140'+).
140'0" and over
1 front escort + 1 rear escort140' long or more: front + rear escorts + SHA District Engineer approval (COMAR 11.04.04.03 — live law, not dead text).
Front overhang
Requirement
Over 3'0"
Marking requiredFront overhang max 3' legal (Transp. §24-105); overhangs carry an 18"-square reflective flag.
Rear overhang
Requirement
Over 6'0"
Marking requiredRear overhang max 6' legal for divisible loads (§24-105; 4' for auto/boat transporters); 18"-square reflective flag required.
Weight
Requirement
Over 90,000 lbs
Travel window appliesBeltway window: loads over 45 tons, 100'+ long, or 12'+ wide may use I-495/I-95 (Capital Beltway) and I-695/MD 695 (Baltimore Beltway) ONLY 9:00 a.m.–3:30 p.m. (COMAR 11.04.02.06B(2)).Over 45 tons: speed limited to 10 mph under the posted limit (COMAR 11.04.03.02).
Over 120,000 lbs
1 front escortMore than 60 tons: 1 escort (position flips by road type) + 'excessive weight' tier — 10 business days advance application, 9:00–3:30 movement, bond, engineering review; combination loads up to 150,000 lb are allowed on Interstate routes only (manual); >27,000 lb on any axle is itself a superload trigger. The 2008 manual
150,000 lbs and over
1 police escort · route survey · superload75 tons or more: Maryland State Police escort (COMAR 11.04.04.06 prints 'in excess of 75 tons'; the SHA page prints '75 tons or more' — ≥150,000 kept as the safe encode; 65–75 t is MSP-discretionary). Superload process: engineering structural review ($8 × structures crossed; bridge-engineer escort $20/structure, $12 repeat; monitoring $200/day; reviewed permits valid ≤6 months); night window 8:00 p.m.–6:00 a.m. or days 9:00–3:30; >250 tons = 'massive weight', 30 business days advance.MDTA toll facilities: permit moves only during daylight between 9 a.m. MONDAY and 12 noon FRIDAY (weekend ban), ≥1-hr notice to MDTA Police 410-537-7911, far-right toll lane (COMAR 11.04.02.05). Facility bars: Baltimore Harbor Tunnel >8'W or >13'6"H; Fort McHenry Tunnel >11'W, >14'6"H, >85'L or 55 tons. Bay Bridge caps (route file 07/07/2026): 60 t / 15'W / 110'L / 15'4"H, >10'W takes a police escort across; wind: 40+ mph bars house trailers/empties, 55+ closes. The Francis Scott Key Bridge does not currently exist (collapsed 3/2024) — do not route on it.
Movement restrictions
Restriction
In Maryland
Night travel
Daylight hours only
Weekends
Restricted
Holidays
Restricted
Movement hours (COMAR 11.04.02, verified 2026-07-10)
Load
Window
Any permit load
½ hr after sunrise → ½ hr before sunset; Saturday until NOON; Sunday PROHIBITED
full blackout — the Unit re-publishes the list each year after Dec 15
Weather
void under an active snow emergency plan; Bay Bridge wind tiers from 30 mph
Where these permits come from
If you file yourself, this is the office you are dealing with. Check the linked page — some states issue OS/OW permits through their highway patrol or revenue department rather than the DOT.
