Skip to main content
Stay Informed

Sign up for updates and alerts from the Maryland Transportation Authority

Transporting Hazardous Materials Across Our Toll Facilities

The Code of Federal Regulations Title 49 Parts 100 – 199 and the Code of Maryland Regulations (COMAR) govern the transport of hazardous materials across Maryland Transportation Authority (MDTA) toll facilities. 


Vehicles carrying bottled propane gas in excess of 10 pounds per container (maximum of 10 containers), bulk gasoline, flammable liquids, explosives, radioactive and other hazardous materials are prohibited from using the Fort McHenry Tunnel (I-95) or the Baltimore Harbor Tunnel (I-895). Specific information on prohibited and permitted hazardous material transport through the tunnels can be found by visiting the Maryland Division of State Documents' website at to view the applicable COMAR regulations: Title 11, Subtitle 7, Chapter 1 (11.07.01).

Baltimore Harbor Tunnel Thruway (I-895) – Tandem Trailers and Vehicles over 13’-6” in height or 96” (8 feet) in width are prohibited.  Vehicles over 5T GVW - GVRW must use the right lane and are prohibited from the left lane of the approach roadways and tunnel.

Oversize and overweight vehicles, including vehicles over 8’-6” in width, 13’-6” in height, 55’-0” in length and tractor trailers over 80,000 lbs should visit the Maryland Department of Transportation State Highway Administration (MDOT SHA) Commercial Vehicle Operations website to review permit requirements and routing options.


Key Bridge Detour

I-695 Key Bridge has collapsed due to ship strike. Motorists must avoid this southeast corridor of I-695.  I-695 Outer Loop closed at MD 173 (exit 1) and Inner Loop closed at MD 157/Peninsula Expressway (exit 43).

Visit Key Bridge News for more information. 

Oversize and/or Overweight Permit Process

Beginning May 1, 2009, the State Highway Administration (SHA) will administer a $25 permit fee on behalf of the Maryland Transportation Authority for the use of Authority maintained roadways. The $25 fee will cover all Authority roadways that may be used on the vehicle's identified permit route. The fee is applicable to the permit only and does not apply to any tolls incurred. SHA will also be administering the engineering fee for superload moves on Authority roadways to further enhance the permit process. When applicable, the Authority engineering fee will be assessed by SHA and appear on the permit as part of the total cost. These fees will be in addition to any fees already imposed by SHA for the use of state highways it maintains and will be assessed on any permits for travel scheduled May 1 or later.

In addition, the current Class 7 toll will be eliminated effective May 1, 2009. Drivers who previously were charged a Class 7 toll will be charged a lower toll based on the number of vehicle axles. This allows for a single point of contact for permit requests and affords these drivers the convenience of E-ZPass for toll payment. These changes are part of the Authority's cost-recovery initiative that was approved Jan. 29, 2009, and will allow for a more effective hauling-permit system to process oversize and/or overweight vehicles traveling on State maintained and Authority owned roadways. The new fee structure will help ensure the Authority continues to maintain safe and efficient facilities for its commercial-vehicle customers.

Visit SHA's Commercial Vehicle Operations website for more information on hauling permits at:


Public Calendar

May 27

DriveEzMD Team - Orioles Game at Camden Yards

11 AM

Oriole Park at Camden Yards
333 W. Camden Street
Baltimore MD 21201

Hot Dog Race Shirt Day

11am – 1:05pm

Our DriveEzMD Team is in your community! Come talk with us about everything tolling – E-ZPass, Pay-By-Plate & Video Tolling. Pick up an E-ZPass On the Go and save up to 77% on your toll trips.

E-ZPass Pig With O's Bird

May 30

MDTA Board Meeting - May 30, 2024

9 AM


This public meeting is livestreamed and archived on the MDTA Board Meeting Homepage. The MDTA Board Meeting homepage also provides access to the meeting schedule, materials, agenda and minutes.

Jun 06

Capital Committee Meeting - June 6, 2024

9 AM


This public meeting is livestreamed and archived on the Capital Committee Meeting Homepage. The Capital Committee Meeting homepage also provides access to the virtual meeting, schedule, agenda, materials and minutes.