What's the best HOV lane in the US?

I’m trying to find the best High Occupancy Vehicle (HOV) lane in the US. HOV is where certain lanes are only available to people who are traveling with other people. Here in San Diego, you can also pay to take the HOV to or from the City.

I’d like to hear about really “good” such lanes. “Good” could mean that taking the lane saves you a lot of time. Or that taking the HOV saves a big percentage of time you’d otherwise spend. Another measure might be how much people pay to use it.

In San Diego, you could say during rush hour you can save 30 minutes, save half your time. And people pay $5.50 at peak to use it.

What’s it like where you live?