There are plenty of slug line commuter parking lots around the area that you can find people that will ride for free in your car so everyone can take advantage

There are plenty of slug line commuter parking lots around the area that you can find people that will ride for free in your car so everyone can take advantage of HOV lanes. It's definitely a thing in some places where the passengers have no real need to be going anywhere in DC, people are just trying to get to work.