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Tolls on the Baltimore Harbor Tunnel are calculated based on the number of axles for your vehicle. When counting axles, make certain to count the axles with wheels on the ground, including any axles on trailers you may be towing.
There are 6 axle designations for Maryland.
When calculating a toll, the following options will be available in the calculator's drop-down menu:
Count each axle with wheels on the ground.
More detailed vehicle class information may be found on the Toll Payments page.