It sounds as though sluggers and their drivers in the region are getting favorable attention. US Representative Gerald E Connoly (VA-D) wrote a letter to the DC police asking them to leave slugs and their drivers alone in a response to tickets that were handed out last month. You can read more about the situation on Dr. Gridlock's column.
Slugging is another option to driving alone that we promote at Arlington Transportation Partners. At first people are a little leery of the practice, "Get in a stranger's car to get to work?" It seems to go against everything you may have learned growing up. But it works well in this region and has become a true alternative that allows people to save time on getting to work by utilizing the HOV lanes.
Although many of the slug lines have been active for many years, there are new locations forming periodically. Right outside my back office door is a hub of Rosslyn destination slugs. If you haven't seen the process in action, it is quite interesting. Find a morning or afternoon slug line near you and check it out!