This would never work here

I can foresee many problems, one being they would need to hold them above their heads at the statutory height for road signs, also how the heck do you get from 60 to 40 in such short distance. I wonder if they have another further on to penalise those that ignore the signs and give them a good booking.

https://www.msn.com/en-gb/news/world/russia-uses-topless-models-to-enforce-speed-limit/ar-AAiyni0