Here's a clue: they aren't US drivers. They just happen to be in the US.
Northern NM has some strange social pathologies involving real estate, too. Many families have been there for 400+ years, and they think differently about things.
My understanding is that Santa Fe had to start hiring
Green Card Mexican Nationals to be their police officers...
no one else could “afford” to live there at the pay scale the city provided.
Family and I spent one night(2001) in Tierra Amarilla...famous for a 1967 “raid” led by Reises Tijerina (a Texan)-I will not involve myself in their local politics...
But the People of Tierra Amarilla are wonderful people and
treated my family well.
https://en.wikipedia.org/wiki/Tierra_Amarilla,_New_Mexico
https://en.wikipedia.org/wiki/Reies_Tijerina
https://en.wikipedia.org/wiki/Alianza_Federal_de_Mercedes