I don’t know of another State that does this. In New York, construction crews, DGS, security personnel and others are perfectly capable of putting on a reflective vest and directing traffic.
When I worked in Brighton, we had a parking garage that needed some traffic direction at 5:00PM. Hard to explain, but it’s location made it difficult to otherwise leave onto the road without some support.
The building managers had security do traffic for several months, everyone was happy. Then one day it stopped and people freaked out.
Turns out the city caught wind of this and threatened a fine because there was no cop on duty. Now the building owners were basically required to pay for a cop’s overtime.
After a few stressful weeks, there was a cop directing traffic on the same spot. Did a far worse job. Oof.
Just a small example at how police unions are constantly at odds with public safety.