slug line
n.— «HOV rules created what is commonly called the slug line. You cannot get on the HOV at 7am unless you have three people in the car. Because of that, solo drivers who do not want to sit in two hours of traffic will swing by the slug line, pick up two people and zip into downtown in just half an hour.» —“Houston commuters are saving time with the slug line” by Jeff Ehling KTRK-TV (Houston, Texas) June 7, 2007. (source: Double-Tongued Dictionary)