I do not see this as a huge issue at this point.
Colorado is no where like California.

Colorado has about 15 miles of HOV lanes.
Total.
State Wide.
And that's in the Denver Downtown area only.
I've seen them on I25 ( about 8 miles worth )
and US 36 ( about 7 miles worth ) and that's it.

Luckily, at this point, most areas of Colorado don't need HOV lanes!
-John