On the newly-opened 22.5-miles of 66 Express Lanes, located outside the Beltway from Route 29 in Gainesville to I-495 (Capital Beltway), vehicles must have three or more occupants, and an E-ZPass Flex switched to the “HOV On” mode, to travel the lanes toll free. The 66 Express Lanes Outside the Beltway and HOV-3+ rule is in effect 24 hours a day, seven days a week.

On the existing nine miles of 66 Express Lanes, located inside the Beltway from I-495 to the D.C. line, vehicles must also have three or more occupants, and an E-ZPass Flex switched to the “HOV On” mode, to travel the lanes toll free. The 66 Express Lanes inside the Beltway and HOV-3+ rule is in effect on weekdays only during peak periods in peak commute directions.