The Virginia Department of Transportation will introduce a tolling system on the inside-the-Capital Beltway portion of I-66. Here is some of the information you need to know to prepare for the transition.

When does tolling begin?

If testing goes without any major glitches, tolling will begin in December.

Where?

Interstate 66 on the portion between Interstate 495 and Route 29 in Rosslyn.

When will tolls be in effect?

Weekdays, 5:30 to 9:30 a.m. eastbound and 3 to 7 p.m. westbound. The lanes will remain free to all users during the off-peak hours and weekends.

Who will have to pay?

Solo drivers who are traveling in the lanes in the peak direction during peak times. That includes drivers of hybrid vehicles.

Motorcycles and vehicles carrying two or more people can use the lanes free.

How will users pay?

There will be no toll booths or cash payments. Tolls will be collected electronically; solo drivers will need an E-ZPass and carpoolers need an E-ZPass Flex, which allows drivers to use the lanes free when set on carpool mode. For more information about how to get an E-ZPass transponder visit www.ezpassva.com.

When drivers pass under overhead gantries, their E-ZPass account will be debited in the amount of the trip. Drivers without an E-ZPass device will receive a bill on the mail, including a penalty for not having an E-ZPass.

What will be the amount of the tolls?

The toll will vary depending on traffic. The state says the requirement is to maintain a minimum average speed of 45 mph. The price will vary to control congestion to achieve that goal. There is no cap on the toll pricing, which means the toll will increase as congestion rises and decrease as congestion lessens.