It's pretty clear that the HOV lanes aren't really about congestion. Or that the decision on who can use it isn't based on anything rational.
California used to allow hybrids to use the car pool lane. When that expired and they only allowed plug-ins in the car pool lane, and interesting thing happened - the average commute time for everyone went up. It was better for traffic flow to have the hybrids in the car pool lane, because there were fewer cars in the other lanes.
Takeaway from this "experiment" is that if you want to reduce congestion, it's probably best to just open the HOV lane to all traffic, thus increasing the number of lanes available.
California used to allow hybrids to use the car pool lane. When that expired and they only allowed plug-ins in the car pool lane, and interesting thing happened - the average commute time for everyone went up. It was better for traffic flow to have the hybrids in the car pool lane, because there were fewer cars in the other lanes.
Takeaway from this "experiment" is that if you want to reduce congestion, it's probably best to just open the HOV lane to all traffic, thus increasing the number of lanes available.