No disrespect... but every Prius driver I have ever had in front of me drives super slow...
As far as driving in the HOV lanes... I really don't think there are that many Hybrid drivers out there yet. That carrot was put out to get people to switch to a cleaner alternative. It didn't really catch on that great. Gas prices were a much better motivator...
And now the Hybrids can sit in gridlock with the rest of us...