Maryland toll roads use three payment systems, and which one you use depends on whether you have a transponder, pay by mail, or use a toll-by-plate camera system

Maryland's toll roads — the Maryland Toll System — are operated by the Maryland Transportation Authority. The main toll roads are the Baltimore-Washington Parkway, the Chesapeake Bay Bridge, the Fort McHenry Tunnel, and several others. You have three ways to pay: with a transponder (a small device mounted on your windshield), by mail after receiving an invoice, or through the toll-by-plate system, which photographs your license plate and sends you a bill.

Each method has different costs and convenience levels. Transponder users pay the lowest toll rate. Mail payment costs more per toll. Toll-by-plate is the most expensive option and is meant for occasional drivers or out-of-state visitors who don't have a transponder.

Key Takeaways

  • Maryland offers three payment methods: a transponder (lowest cost), paying by mail after receiving an invoice (medium cost), or toll-by-plate through license plate photography (highest cost).
  • A transponder is a small device you mount on your windshield that communicates with toll readers and automatically deducts the toll from a prepaid account.
  • You can set up a transponder account online through the Maryland Transportation Authority website or by phone at 1-888-321-6714.
  • If you don't have a transponder, the toll booth will photograph your plate, and you'll receive a bill in the mail within two weeks.
  • Toll rates vary by road and vehicle type, and transponder users pay less than drivers who pay by mail or toll-by-plate.

Getting a Maryland Transponder

A transponder is the most economical way to pay tolls on Maryland roads. The device is small, mounts on your windshield, and communicates with toll readers as you pass through. The toll is deducted automatically from your prepaid account, and you never have to stop.

To get a transponder, visit the Maryland Transportation Authority website at mdta.maryland.gov or call 1-888-321-6714. You'll need to provide your name, address, phone number, email, and vehicle information (make, model, year, and license plate number). You can choose to pay online with a credit or debit card, or by check. The transponder itself is typically free, though some accounts may have a small setup fee depending on your payment plan.

Once your account is set up, the transponder will be mailed to you. When it arrives, mount it on the inside of your windshield, centered and as high as possible. set up it through your online account or by calling the number above. Your account will be ready to use within a few days of set up.

Paying by Mail After Receiving an Invoice

If you pass through a toll booth without a transponder, the toll booth camera will photograph your license plate. The Maryland Transportation Authority will look up your vehicle registration and mail you an invoice within two weeks. This invoice will show the toll amount, the date and time you passed through, and the toll road location.

Pay the invoice by the due date shown on the bill. You can pay online through the MDTA website, by mail, or by phone. If you pay online, you'll need the invoice number. Mail payments should be sent to the address printed on the invoice. Phone payments can be made by calling 1-888-321-6714.

If you frequently use Maryland toll roads without a transponder, you'll pay a higher rate per toll than transponder users. Consider getting a transponder to lower your costs over time.

Understanding Toll-by-Plate Charges

Toll-by-plate is the system that automatically charges your account when a camera reads your license plate. This happens whether or not you have a transponder — if your transponder doesn't register for any reason, the system falls back to toll-by-plate as a backup.

Toll-by-plate charges are higher than transponder rates. This method is designed mainly for out-of-state drivers or occasional users who won't be getting a transponder. If you live in Maryland or use the tolls regularly, a transponder will save you money.

If you receive a toll-by-plate bill and believe it's incorrect, you can dispute it by contacting the Maryland Transportation Authority. Have your invoice number and the details of the toll ready when you call.

Setting Up and Managing Your Account Online

The Maryland Transportation Authority website at mdta.maryland.gov lets you manage your transponder account from home. You can add money to your prepaid balance, update your payment method, change your address, and view your toll history.

To log in, you'll need your account number and password. If you don't have an account yet, you can create one during the transponder registration process. Once logged in, you can set up automatic replenishment so your account refills when the balance drops below a certain amount. This ensures you never run out of funds and have to pay the higher toll-by-plate rate.

You can also manage your account by phone at 1-888-321-6714. Customer service representatives can help you add money, update your information, or answer questions about your tolls and charges.

Toll Rates and Vehicle Classifications

Maryland toll rates depend on the specific road, the direction of travel, and your vehicle type. The state classifies vehicles into categories: passenger cars, motorcycles, light trucks, heavy trucks, and commercial vehicles. Each category has a different toll rate.

Transponder users pay the lowest rate for their vehicle class. Drivers who pay by mail pay more. Toll-by-plate users pay the highest rate. Rates also change during peak and off-peak hours on some roads, with higher tolls during rush hour.

To see current toll rates for a specific road, visit the MDTA website and use the toll calculator. Enter your vehicle type and the road you'll be using, and it will show you the transponder rate, the mail payment rate, and the toll-by-plate rate.

What to Do If You Receive a Toll Bill You Don't Recognize

If you receive a toll invoice for a road you don't remember using, or if the amount seems wrong, contact the Maryland Transportation Authority before paying. Have the invoice in front of you and note the date, time, and toll road listed.

Call 1-888-321-6714 or visit the website to dispute the charge. The MDTA can review the toll booth photo and confirm whether the toll was correctly assessed to your vehicle. If there was an error — for example, if your plate was misread — they can adjust or remove the charge.

If you believe someone else used your vehicle without permission, report it to the MDTA as well. They can flag your account and help you investigate.

Frequently Asked Questions

Do I have to get a transponder to use Maryland toll roads?

No. You can drive through without one and pay by mail or toll-by-plate. However, you'll pay a higher toll rate. If you use the roads regularly, a transponder saves money and is more convenient because you don't have to stop or wait for a bill.

How long does it take to receive a toll bill in the mail?

The Maryland Transportation Authority typically mails invoices within two weeks of the toll transaction. The due date is usually 30 days from the invoice date. Check your mail regularly so you don't miss the payment important date.

Can I use my Maryland transponder on toll roads in other states?

Maryland transponders work only on Maryland toll roads. Other states have their own toll systems. If you travel to other states with tolls, you'll need to pay by mail or toll-by-plate in those states, or get a transponder specific to that state.

What happens if I don't pay a toll bill?

If you don't pay by the due date, the Maryland Transportation Authority may send a second notice with a late fee added. If you continue not to pay, they can suspend your vehicle registration or pursue other collection methods. Pay your bill on time to avoid these consequences.

Can I transfer my transponder to a different vehicle?

Yes. Contact the Maryland Transportation Authority online or by phone and provide your new vehicle's information. They'll update your account and may mail you a new transponder if needed, or you can reuse the existing one if it's still in good condition.