This is a complicated report and will take more study than I plan to give it...
...to determine if it, indeed, proves that HOV lanes "do not work".
One point I would make is that it only examined a few highways in Minnesota. Also, the conditions do not look at all like the conditions that prevail where I live in LA area. For instance, I can't think of anywhere that the diamond lane comprizes 25% of the driving lanes, as it seems to in MN.