Dirtclods wrote:
Your assuming those plates were from Colorado.
http://www.ouraycolorado.com/things-to-do/4x4/ohv-tips
http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5423350.pdf
https://townofmountainvillage.com/media/Ordinance-2016-03-Ordinance-Adopting-Regulations-for-Off-Highway-Vehicles-Utility-Type-Vehicles-Special-Mobile-Machinery-and-Golf-Carts-on-Town-Streets.pdf
These links confirm that it depends on the area as to whether or not they are allowed. Some towns allow them, some don't. Some are legal in town, but only on certain roads. Some are legal in town, but you run into problems once you leave the town limits and have to deal with the state police. Same goes for whether or not it's considered "street legal" in another state.
The OHV registration here is NOT the equivalent of a license plate. It's a sticker, and doesn't mean the vehicle is street legal, they're required for anybody who has their UTV of any kind off of a trailer in the state (Even if just parked).
From what I know (we have a RZR), Telluride is a complete pain in the you know what about UTVs, even when licensed in another state.
This thread from the RZR forum is a few years old (Has an update towards the end from 2015), but informative: http://www.rzrforums.net/general-rzr-discussion/130172-street-legal-utv-colorado.html