I-66 is a major east-west highway that connects downtown Washington D.C. to Northern Virginia. Since it is the only major east-west highway between D.C. and the populous Virginia suburbs, I-66 experiences heavy traffic congestion especially during peak hours.
To alleviate congestion, public authorities initially implemented peak period High Occupancy Vehicle (HOV) restrictions along the portion of I-66 inside the I-495 beltway. In 2017, the Virginia Department of Transportation (VDOT) altered the restrictions on this I-66 segment and switched from HOV to High Occupancy/Toll (HOT) lanes. After the change, users can access the lanes during peak periods by paying a toll, which is dynamically set based on demand, or by having multiple people in their vehicle.
(Our website has many links to other organizations. While we offer these electronic linkages for your convenience in accessing transportation-related information, please be aware that when you exit our website, the privacy and accessibility policies stated on our website may not be the same as that on other websites.)