Heh, just avoided having to navigate that last weekend - visiting family in Springfield and went to dinner at CSG, just north of that circle.
That must be the Taos Junction Bridge, on NM 570 / 567. I did that in a rental car one trip to Taos - wasn’t expecting the dirt road on the west side of the bridge! Thankfully it was a perfectly clear and dry day and the drive wasn’t too bad. Beautiful country.
I’ve never been on it but just looked at it from Google Street View. That looks like a perfectly acceptable rural mountain road - for a one way street. It would be quite nerve wracking to do having to watch for traffic both ways in addition to conditions if it were wet or snowy.
Oh, I’m used to driving dirt roads of various quality: Forest Service, BLM, NPS, you name it. And having to find places to let people pass. Just most of those times you don’t have a deadly drop to your right and the only way out is through.
Fun fact: If you go just about a quarter mile south on the right, you can see the GSA warehouse where Indy hid the Arc of the Covenant. (1.3million sq.ft.)
My thought was, that the funds to build the bridge dried up somehow. Or there was a political fight about which neighborhood would have all the traffic. Either way, what they saved wasn’t worth what they ended up with.