Please note that if you use I-66, HOV restrictions (at least 2 people in vehicle) are in place travelling EAST in the mornings from 5:30 am to 9:30 am and travelling WEST in the evenings from 3:00 pm until 7:00 pm.
Solo drivers have the option of paying a toll via E-Z pass to use the lanes in the peak direction during rush hour periods. The lanes will remain free for HOV-2+ vehicles (with E-Z Pass Flex), buses, motorcycles and emergency response vehicles.
These restrictions apply to cars going to or from Dulles International Airport. The lanes are free to all users during off-peak periods, including weekends.