All that happens with speed tables in the city is that the people who live on a street with speed tables have to deal with the constant shaking and noise of cars blasting over them at speed. And the ones they install on 2nd Street don't last. The end up as piles of broken plastic and tire-mangling bolts sticking out of the asphalt.

I'm okay with traffic calming measures that jut into the street though. When we visited England last year, my wife did all the driving. "What the fuck is this?!" she exclaimed, slowing down because the street suddenly got narrow. The system works!

Still, neither of these are going to erode the culture of speeding quite like speed cameras. It may take longer, but when you keep getting dinged for speeding, over and over, you generally change your behavior. And at the very least, they can tell a story about how the proceeds from speeding cameras can go to something that benefits the community. No promises that it actually gets accounted for properly. Automated enforcement is notoriously abused once you get people in power that turn a blind eye to it.