Dashcam. You can buy chineseoated dash cams for cheap nowadays. I've got one that points forward, and has a long tiny wire which goes to a second tiny camera for the rear. At the time it was about 80 bucks.
Then I'd have a video of something they won't do anything about. :D
I already told them if I or someone in my family get hurt by some A hole breaking traffic laws that I will sue the city for the laws not being enforced.
I also asked them if they could imagine riding a motorcycle in a town that no one uses signals.
I am a pretty well known local business owner, so they know who I am. (not that it means anything really)
But for about a week after that there were cars pulled over everywhere you looked (only for that week) then back to total mayhem.