New VDOT I-66 HOT Lanes Predicted to Attract “Slugs” predicts that “slugging” (“a form of commuting where riders ride free and the drivers — many of whom have a reserved parking space at their work or choose to pay for parking — get to skip the congestion on the main travel lanes and get to work faster”) will become a popular option when VDOT’s new I-66 HOT lanes open.