Better street designs is a better approach. Narrower lanes, physical barriers for pedestrians, roundabouts, etc
Pretty sure the shithead that killed a family in King County two years ago, while doing 110 in a 40 zone (after already wrecking two cars) didn't give two figs about street design. Casual speeders would benefit from better street engineering. Excessive speeders don't care. They just don't understand the concept of consequences. A speed governor would have likely saved four lives, and that 18-year old man from a 17 ye…
My understanding is that a good engineered road will not gently suggest you to drive at this or that speed, but will make you so forcibly.