Oooh, you guys are scraping the vertical paint for zippers. Our city dabbled with zippers, but immediately had to put orange cones up, as drivers just ran over them. Zippers would be much more effective if they were rotated 90° so that they were head on instead of a glancing blow to cars.
But at that point, you might as well throw in concrete crash barriers or orange construction barriers instead. Zippers don't really do much.
Or flexposts covered in anti-slip, high grit sandpaper.
Poor man. I wish the Project Veritas "journalist" a very interesting life for inflicting so much pain and suffering on some normal person.