The I-95/395 HOV lanes in Northern Virginia will again be closed overnights this weekend.
Traffic is moving again, but delayed.
Traffic shift is part of program to add a lane in each direction.
Virginia officials are attracted to the idea, but the case for express lanes isn't proved.
Adding HOT lanes is among the traffic and transit concepts under study, with major decisions planned for next year.
The earlier change in directions is meant to ease summer traffic.
Trespasser claimed to be mixing chemicals. A search has found nothing dangerous.
The road is closed for about eight miles.
Commuters want something to happen, but fear the prospect of adding HOT lanes.
The Virginia governor talked favorably of the parkway getting a high-priority rating in a state review.