ODPERMIT / STATE FIELD GUIDE DC
District of ColumbiaOversize & overweight permits.
A District of Columbia move needs the exact streets, loaded dimensions and DDOT permit conditions. Check specified truck routes, pilot-car recommendations and when to contact MPD for police escorts.
General information only, not legal advice or a permit. Confirm with the issuing agency before you move. Read the disclaimer
AI-generated illustration · not to scale
- 01Legal size
What is legal without a permit?
Axle limits Legal With a permit- A 1,000 lb tolerance applies to axle loads.
The rule in full6 official sources
Road-dependent width: 8′–8′6″
8′ generally; 8′6″ for qualifying buses and tractor-trailers on specified routes. Check the exact vehicle and streets.
Loaded height: 13′6″
General vehicle-and-load limit; actual bridge and structure clearances still control.
NN semitrailer: 48′
Federal National Network allowance for a tractor with one semitrailer. Longer trailers may qualify under state axle-position and route rules; local roads can differ.
Overall length: 55′ generally
*For a tractor with one compliant semitrailer on the National Network. Other combinations, trailers, projecting loads and local access have separate limits; see the state measurements below.
Interstate weight: 80,000 lb*
*Federal baseline, subject to the bridge formula, registration and postings: 20,000 lb single axle and 34,000 lb tandem. A particular configuration may have a lower limit; state grandfather allowances need verified spacing and route eligibility.
Legal size and weight
The general width limit is 8′, with 8′6″ exceptions for qualifying buses and tractor-trailers on specified routes. The height limit is 13′6″; verify actual bridge and structure clearances. Weight limits depend on axle groups, spacing, tires, gross weight, bridge tables and route postings.
Width
Under 18 DCMR § 2501, the general width limit is 8′. Buses and tractor-trailers can be 8′6″ on specified routes.
Height
Under 18 DCMR § 2501, the height limit is 13′6″. That does not guarantee clearance under every structure.
Overhang
Under 18 DCMR § 2503, the load can project 3′ in front and 6′ behind.
Length
The usual combination limit is 55′ overall, including the load and bumpers. On routes listed in 18 DCMR §2511, a tractor with a semitrailer up to 48′ is exempt from that limit. Kingpin distances, doubles, buses, pole trailers and emergency moves have separate rules; check the exact setup and streets.
Axle limits: legal and with a permit
Legal: single (gross 73,000 lb or less) 21,000 lb, single (gross over 73,000 lb) 20,000 lb, tandem (gross over 73,000 lb) 34,000 lb. With a permit: . A 1,000 lb tolerance applies to axle loads.
- 02Requirements
Where each requirement starts
Permit maximumWidth over 11′Truck crane and concrete pump annual tags allow up to 11′ wide; wider trips need a single-haul permit.
9DDOT District Freight Program — Oversize/Overweight Vehicles · checked Oct 13, 2026What official sources leave open10
Where District of Columbia’s official sources disagree or say nothing, confirm with the agency before dispatch.
- Police escort thresholds conflict: DDOT's 2011 FAQ (ddot.dc.gov overweight_vehicles.pdf) said police escorts are required at 75′ long or longer, 12′ wide or wider, over 13′6″ high or 120,000 lb or more; the current DDOT page and 2024 FAQ only recommend pilot cars at those sizes and send carriers to MPD at 15′ wide, over 14′6″ high or 150,000 lb. The current page and FAQ are used.
- Single-axle limit conflict: the current DDOT page lists 21,000 lb in one section and 20,000 lb in another; the 2024 FAQ says 20,000 lb; 18 DCMR § 2505 sets 21,000 lb, dropping to 20,000 lb (34,000 lb tandem) when gross exceeds 73,000 lb.
- Width trigger wording differs: the 2024 FAQ says a permit is needed for 'any vehicle wider than 8 feet', the 2011 FAQ said 8′6″, the current DDOT page allows 8′6″ for tractor-trailers 'moving only on a freeway or interstate', and 18 DCMR § 2501.3 allows 8′6″ tractor-trailers only on the § 2511 specified routes.
- Annual tag conflicts: the current page lists $63 (tractor-trailer) and $56/$77 (crane or pump) while the 2024 FAQ lists $85 for each; the page sends crane and pump tags to a single-haul permit over 80,000 lb gross, the FAQ over 120,000 lb.
- DDOT publishes no standard travel hours, night, weekend, holiday or rush-hour rules for permitted loads; the issued permit sets them.
- No DDOT rules found for OVERSIZE LOAD signs, flags or lights on the load, pilot car equipment, or pilot driver certification; 18 DCMR § 2502.10 only requires clearance markers and end marker lamps for long pole-trailer loads at night.
- No superload, engineering-review or route-survey thresholds are published.
- The FAQ link redirects to a short-lived signed download URL, so the stable DDOT link is listed instead.
- MPD contact wording differs: the current page says loads 'exceeding' 15′ wide, 14′6″ high or 150,000 lb; the 2024 FAQ says 15′ wide 'or more' and 150,000 lb 'or more'.
- 18 DCMR § 2502.11 exempts tractor-semitrailers with a kingpin distance of 41′ or less from the 40′/55′ length limits and the § 2511.3 route limit; DDOT's permit pages do not mention this exemption.
The rule in full4 official sources
Width 8′: Legal width
8′ is the general as-of-right width; 15+ passenger buses and tractor-trailers moving only on a freeway or Interstate may be 8′6″. Wider needs a permit.
Width 8′6″: 8′6″ on specified routes
Under 18 DCMR, tractor-trailers may be 8′6″ wide only on the specified routes in § 2511.
Width 11′: Crane/pump annual tag max
Truck crane and concrete pump annual tags allow up to 11′ wide; wider trips need a single-haul permit.
Width 12′: Pilot car recommended
Over 12′ wide: DDOT recommends a private pilot car (P/EVO); TOPS then notifies the Metropolitan Police Department.
Width 15′: Contact MPD for police
Over 15′ wide (the 2024 FAQ says 15′ or more): contact MPD's Motor Carrier Safety Unit to confirm whether police escorts are needed on top of pilot cars.
Height 13′6″: Legal height
Up to 13′6″ high, including the load; taller needs a special permit.
Height 13′6″: Pilot car recommended
Over 13′6″ high: DDOT recommends a pilot car.
Height 14′: 2 pilot cars recommended
Over 14′ high: DDOT recommends two pilot cars, one in front and one behind.
Height 14′6″: Contact MPD · pole car
Over 14′6″ high: contact MPD's Motor Carrier Safety Unit to confirm whether police escorts are needed; a pole car escort may be required.
Length 40′: Legal single unit
Single-unit vehicles over 40′ (including load and bumpers) need a permit.
Length 55′: Legal combination
Combinations over 55′ need a permit, except a tractor with a semitrailer up to 48′ on the specified routes.
Length 70′: Tractor-trailer annual tag max
A tractor-trailer annual tag allows up to 70′ overall; longer trips need a single-haul permit.
Length 75′: Pilot car recommended
Over 75′ long: DDOT recommends a pilot car.
Overhang 3′ front: Legal front overhang
A load may not extend more than 3′ past the front of the vehicle without a permit.
Overhang 6′ rear: Legal rear overhang
A load may not extend more than 6′ past the rear of the vehicle without a permit.
Weight 80,000 lb: Legal gross
80,000 lb gross; heavier needs a permit.
Weight 120,000 lb: Pilot car recommended
Over 120,000 lb: DDOT recommends a pilot car.
Weight 150,000 lb: Contact MPD for police
150,000 lb or more: contact MPD to confirm whether police escorts are needed.
- 03The permit
Which permit do you need?
- DDOT issues District special permits.
- The exact streets, specified routes and other facility owners' rules still control.
Applying in TOPSSingle haul 1 week · annual 2 weeks
Register on TOPS, DDOT's online permitting system, and apply there (or call 202-442-4670 for help). Allow one week for a single-haul permit and two weeks for an annual permit; DDOT confirms the route based on size and weight.
8DDOT — Oversize and Overweight Vehicles Frequently Asked Questions (OSOW_FAQ_07.25.2024.pdf) · checked Oct 13, 2026Single-haul permitEach inbound, outbound or round trip
Any vehicle over the as-of-right limits needs a single-haul permit for each inbound, outbound or round trip in the District ($30 one-way, $50 round trip). Annual-tag holders also need one for trips beyond their tag's limits.
9DDOT District Freight Program — Oversize/Overweight Vehicles · checked Oct 13, 2026Special permit conditionsStreets, season and security on permit
Applications must name the vehicle, load and exact streets. The Director may set seasonal or other limits and may require security to cover road damage.
718 DCMR § 2508 — Special Permits · checked Oct 13, 2026Official route and permit tools- TOPS — DDOT online permittingApply for single-haul permits and annual tags
- DC Truck MapTruck routes, posted clearances and weight limits
- DDOT oversize/overweight vehiclesThresholds, permit types and escort guidance
- Commercial vehicle routes and restrictionsDDOT truck routing
- DDOT OSOW FAQ (PDF)Police escort contacts and processing times
- 18 DCMR Chapter 25 (size and weight rules)Full regulation text by section
The rule in full5 official sources
The permit authority
DDOT issues District special permits. The exact streets, specified routes and other facility owners' rules still control.
Special permits
Above the Chapter 25 limits, DDOT's Director can issue a written special permit. The application, the exact streets and the permit's conditions control.
Annual permits and superloads
Routine, annual, superload and engineering-review permits each depend on the exact permit type, vehicle setup and route.
- 718 DCMR § 2508 — Special Permits Checked
Applying in TOPS
Register on TOPS, DDOT's online permitting system, and apply there (or call 202-442-4670 for help). Allow one week for a single-haul permit and two weeks for an annual permit; DDOT confirms the route based on size and weight.
Single-haul permit
Any vehicle over the as-of-right limits needs a single-haul permit for each inbound, outbound or round trip in the District ($30 one-way, $50 round trip). Annual-tag holders also need one for trips beyond their tag's limits.
Special permit conditions
Applications must name the vehicle, load and exact streets. The Director may set seasonal or other limits and may require security to cover road damage.
- 718 DCMR § 2508 — Special Permits Checked
- 04Permit cost
What does the permit cost?
Example agency fee$30- 8′7″ W
- 13′ H
- 70′
- 72,000 lb
- 100 miles
The rule in full2 official sources
Example agency fee
$30 for a nondivisible load 8′7″ wide, 13′ high and 70′ long at 72,000 lb gross, on a five-axle truck with a 48′ trailer, for 100 miles in District of Columbia. Enter your own load in the calculator below.
What the fee covers
DDOT lists $30 for a one-way trip and $50 for a round trip. This calculator estimates a one-way trip. Local permits, escorts, tolls, payment charges and ODPermit services are separate.
- 05Pilot cars
When do you need pilot cars?
The rule in full4 official sources
Confirm conflicting police-escort thresholds
DDOT’s archived FAQ requires police escorts at 12′ width, above 13′6″ height, 75′ length or 120,000 lb. Its current permit FAQ recommends pilot cars above similar limits and gives higher police thresholds. Plan for possible police at the lower thresholds and confirm the route-specific assignment with DDOT and MPD before booking or dispatch.
MPD police escorts
Police escorts are at the Metropolitan Police Department's discretion. Email MPD (motorcarrier@dc.gov) to find out whether one is needed when the load is: 15′ wide or more. Over 14′6″ high (a pole car may be required). 150,000 lb or more. Carrying hazardous materials, or Class 1 explosives (Division 1.1, 1.2 or 1.3).
Pilot cars (recommended)
DDOT recommends a private pilot car (P/EVO) when the load exceeds: 75′ long. 12′ wide. 13′6″ high; over 14′ high, two pilot cars (front and rear). 120,000 lb gross.
On any oversize move
DDOT's published FAQs disagree. The archived FAQ requires police at 12 ft width, above 13 ft 6 in height, 75 ft length or 120,000 lb. The current permit FAQ instead recommends pilot cars above similar limits and names higher police thresholds. Plan for possible police at the lower thresholds and obtain DDOT/MPD's route-specific assignment before booking or dispatch.
- 06Travel hours
When can you move?
Move only on the dates and hours printed on the permit.The rule in full2 official sources
Travel hours
Follow the dates, hours and conditions on the permit, including any seasonal or time limits. Check the authorized route before moving.
- 718 DCMR § 2508 — Special Permits Checked
Check before you move
Right before moving, check closures, construction, posted limits, weather, local restrictions and the permit's route conditions.
- 618 DCMR § 2511 — Specified Routes Checked
- 718 DCMR § 2508 — Special Permits Checked
Specified truck routes
Vehicles using the specified-route allowances (§§ 2501.3, 2502.3, 2502.4 and 2502.6: 8′6″ tractor-trailers, 48′ semitrailers, doubles and triples) may use only I-295 (from the Maryland line), I-695, I-395 (from the Virginia line), the Anacostia Freeway and Kenilworth Ave NE. Other streets need a special permit.
- 618 DCMR § 2511 — Specified Routes Checked
- 07Flags & lamps
Signs, flags and lights
The rule in full3 official sources
Securing the load
Keep the load within the manufacturer's capacity and secure it against shifting, toppling or creating a hazard. Securely fasten every tarpaulin or other covering, and follow the issued permit's safety conditions.
Bridges
A vehicle over the § 2505 weight limits may not cross any District bridge without the Director's written permission; a lower posted bridge limit controls.
- 1118 DCMR § 2510 — Bridge Restrictions Checked
Tunnel hazmat ban
Placarded vehicles and tank vehicles used for flammable liquids or hazardous materials, loaded or empty, may not enter the I-95 freeway tunnel (up to K Street) or the Ninth Street Expressway tunnel, or their access ramps.
- 1218 DCMR § 2509 — Tunnel Restrictions Checked
Secure the load
Keep the load within the manufacturer's rated capacity, secure it against shifting or toppling, and fasten any tarp securely.
- 08Driver paperwork
What the driver carries
- Paper permit and tagsCarry the paper permit in the vehicle and make it available for inspection.
- Carry the paper permitPrint the permit from your TOPS account and keep the paper permit in the vehicle at all times.
Carry the paper permitPaper permit · tag on the front
Print the permit from your TOPS account and keep the paper permit in the vehicle at all times. Annual tags must be fixed to the front of the vehicle where other drivers can see them.
8DDOT — Oversize and Overweight Vehicles Frequently Asked Questions (OSOW_FAQ_07.25.2024.pdf) · checked Oct 13, 2026The rule in full1 official source
Paper permit and tags
Carry the paper permit in the vehicle and make it available for inspection. For annual tag permits, affix the tag visibly to the front of the vehicle.
Carry the paper permit
Print the permit from your TOPS account and keep the paper permit in the vehicle at all times. Annual tags must be fixed to the front of the vehicle where other drivers can see them.
- 09Special permits
Special loads and permit programs
- One specific vehicle on non-truck-restricted streets for up to a year: Tractor-trailer: up to 70′ overall
Long poles and pipesOver 80′ · permit · night markers
A pole, pipe or other material over 80′ long needs a permit day or night. At night, pole-trailer loads need clearance markers on both sides and marker lamps on the ends of any projecting load.
418 DCMR § 2502 — Length of Vehicles, Trailers, Combinations, and Loads · checked Oct 13, 2026Annual tagsTractor-trailer · crane · dump truck
Annual tags cover one specific vehicle on non-truck-restricted streets for up to a year:
- Tractor-trailer: up to 70′ overall
- Truck crane or concrete pump: up to 11′ wide
- Dump truck, cement mixer or trash truck: up to 65,000 lb gross and 22,000 lb average per axle
The rule in full3 official sources
Special permits
Truck cranes, concrete pumps, dump trucks, cement mixers and trash trucks have their own programs and exceptions. Each has its own eligibility rules.
Long poles and pipes
A pole, pipe or other material over 80′ long needs a permit day or night. At night, pole-trailer loads need clearance markers on both sides and marker lamps on the ends of any projecting load.
Annual tags
Annual tags cover one specific vehicle on non-truck-restricted streets for up to a year: Tractor-trailer: up to 70′ overall. Truck crane or concrete pump: up to 11′ wide. Dump truck, cement mixer or trash truck: up to 65,000 lb gross and 22,000 lb average per axle.
Price your District of Columbia loadAgency fees and pilot-car needs for your loaded rig. Free, no contact details.Open worksheet
DC / Permit worksheet
Price your District of Columbia movement.
Enter the complete loaded vehicle. Get estimated agency fees and escort requirements before sharing your contact details.
The numbers behind your next move.
Your result will show the agency fee breakdown, potential pilot-car requirements, and the rules used to calculate them.
- 01 State agency fee subtotal
- 02 Escort & survey considerations
- 03 Sources & pricing assumptions
Single-state pricing uses the mileage you enter. For a proposed route and intermediate states, use the route calculator.
About the example equipment
The samples use ODPermit’s editable 48 ft flatbed · 5 axles planning profile. Loaded dimensions, gross weight, 100 state miles and District of Columbia registration are example inputs, not a capacity rating or a route approval. Replace them with your actual setup.
Great Dane Freedom flatbed brochure — Drop-deck option: 20–26 in drop from the upper deck with a 40–34 in rear deck height, which gives the 60 in upper-deck planning height. Platform length, combined tare and tractor geometry are editable ODPermit assumptions.
Disclaimer
General information only. It is not legal advice and not a permit. ODPermit is operated by Frontline Express LLC, a private company, not a government agency.
We summarize official sources as of the dates shown, but rules change often and a summary can be incomplete or out of date. Only a permit issued by the state or local agency authorizes an oversize or overweight move, and that permit and the agency’s current rules control. Confirm limits, escorts, routes and travel times with the issuing agency before you move a load.
This information is provided “as is,” without warranties of any kind. To the extent the law allows, Frontline Express LLC is not liable for losses, fines or delays that result from relying on it.
Terms of service apply.
BEFORE THE TRUCK ROLLS
Turn the estimate
into a permitted move.
Confirm the loaded measurements, carrier details, travel dates and exact pickup and delivery. We can help coordinate permits, escorts and route surveys around those facts.
THE SOURCE RECORD
Official references.
Read the rule behind each requirement. These are dated references; current restrictions and the issued permit control your move.
- 01
- 02
- 03
- 0418 DCMR § 2502 — Length of Vehicles, Trailers, Combinations, and Loads
§§ 2502.1–2502.3, 2502.9–2502.10
Source record: - 05
- 06
- 07
- 08DDOT — Oversize and Overweight Vehicles Frequently Asked Questions (OSOW_FAQ_07.25.2024.pdf)
Permit triggers; processing time; police escort; pilot/escort vehicle; cost; what you must do (link redirects to a short-lived signed download)
Source record:
All 14 references
- 09DDOT District Freight Program — Oversize/Overweight Vehicles
What are OSOW vehicles? (dimension and weight thresholds); OSOW Vehicle Permit Types; When do I need an OSOW Vehicle Escort? (client-rendered page, read in a browser 2026-10-13)
Source record: - 10DDOT — archived overweight-vehicle FAQ
Police escort question; conflicts with current permit FAQ
Source record: - 11
- 12
- 1323 CFR 658 Appendix B — National Network semitrailer lengths
Appendix B; 23 CFR 658.13(a)
Source record: - 1423 CFR 658.17 — Interstate gross, axle and bridge weights
23 CFR 658.17(a)–(e); grandfather exceptions are configuration-specific
Source record: