The Wall Street Journal (or, according to Wonkette, the WSJ banking pamphlet) has an article about people who pull over to bus stops to pick up passengers before crossing the George Washington Bridge, saving tolls. They mention carpool savings in San Francisco but miss a bigger point: this is exactly how slugging started in DC, three decades ago!
According to Wikipedia:
The term slug (used as both a noun and a verb) came from bus drivers who had to determine if there were genuine passengers at their stop or just people wanting a free lift, in the same way that they look out for fake coins—or “slugs“—being thrown into the fare-collection box.
The original sluggers would poach riders from bus stops. After a while, slugging queues formed at park-and-rides (on the inbound) and areas with many offices like the Pentagon (on the outbound) and the system became self-reinforcing. Sluggers have an unofficial website now and the system has been around long enough that it is ingrained in a couple of areas. However, one of them may not be New York.
Emily Badger, now of The Atlantic Cities, wrote a long and interesting piece about slugging last year, which outlined several factors that have to be in place for slugging to work:
- The HOV requirement must be 3. HOV-4 is too cramped, and HOV-2 lacks a sense of security. (With three strangers in a car, even if one is crazy they’ll be outnumbered.)
- The HOV lane has to be lengthy or have a high toll, and paralleling traffic has to be bad enough that it saves considerable time. In DC, the 95/395 corridor is one of the most gridlocked in the country, while the carpool lane sails along at freeway speeds. And misuse must be enforced.
- There needs to be a parallel transit system for backup, even if it is slower. Drivers and passengers will not always balance perfectly.
- Employment needs to be situated in dense urban nodes that draw workers from a highway corridor
- Some homogeneity in the workforce. For instance, everyone in DC works for Uncle Sam (or so it seems)
- The existence of park-and-ride lots where riders can congregate (preferably with some amount of cover from the elements)
- Parallel transit can’t be too fast, frequent or reliable, although it’s rare to find fast, reliable and frequent transit in the US. (In other words, if there was a Metro Line along 395 which ran at 110 mph to the District, there would probably be fewer slugs. But since the transit options are a bus with a transfer to Metro, slugging is faster.)
- The end of the system has to be in a transit-served area; the transit, or even bike sharing, can provide a last mile solution from the slug lines (which are sort of like transit stations).