As far as I can tell, Tucson's sky protection regulations aren't limited to stopping streetlights. "With major astronomical observatories within close range, city leaders enacted an outdoor lighting ordinance in 2012 that requires fully shielded lighting and sets limits on the total light produced at night, especially in natural areas and areas close to astronomy sites."

Edit: The gp does mention street lights in the second sentence but that doesn't imply that's all that's done. And hey, no, that's not all the Tucson does.

https://www.darksky.org/nights-over-tucson/