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Denver/Boulder HOV passes?

There is a Tesla at my place of work that has an HOV sticker on the windshield that presumably allows him to travel in the HOV lanes on 25 and 36. But my online searches reveal nothing. Are these still available?

Also, it appears that CO treats EVs and non-pluggable gas hybrids as the same?! Isn't this somewhat silly?
To get HOV access you have to get an ExpressToll+ pass. This is the correct website to learn more about it:

Express Lanes Colorado Department of Transportation - CDOT

Basically it's $15 to upgrade from a regular 470 ExpressPass to the newer HOV one.

The transponders don't work very well behind the Tesla windshield, but you need to mount the "HOV Selectable" transponder inside so that you can switch between HOV and Toll modes. The only place that I have found that usually works is next to the rear-view mirror mount in the "dotted" region.