It's just going to give highly attentive people tickets that want to get to work at a reasonable speed like 30.
The correct solution to get that guy to stop is to make the street less deadly by design. It should be narrowed, made more winding and have visual 'clutter' added like trees, flower planters, etc. It should be intensely uncomfortable to speed more than 5-ish mph, and people who choose to do so anyway need to meet a traffic calming measure and be on the phone to their body shop well before they speed up enough to endanger a life.
The issue with speed bumps is that it's just not a good traffic calming design. Why should a vehicle slow down to, say, 20 kmh at random spots when the limit is 40 kmh? Traffic tables[1] are much better, in that if they're properly installed, you don't need to slow down if you're already going the speed limit. They should be installed at pedestrian crossings to make the crossing level with the sidewalk (cars go up and down) instead of being level with the street (pedestrians go down, then up). The street should be narrowed at pedestrian crossings too, and at all intersections (no parking there anyway).
[0] https://maps.app.goo.gl/sQLFu4zs4AkjNF6r6
[1] https://nacto.org/publication/urban-street-design-guide/stre...
Hitting a kid at 30 is going to cause some harm. I don’t think that 30 is a good compromise.
They are rare where I live but street layouts which promote better driving would help. They have low/no kerbs and wind through planting etc to keep speed down.
However this messes up a commute to work, so unfortunately it’s not a perfect solution.
The solution here is just to not hit them to begin with.
I think it's 30mph is a reasonable speed for not hitting people.
Careful, some people actually want to ban cars.
Your city failed to properly design streets and enforce traffic laws. This happened because, over many decades, the voters in your city wanted it to be so, and voted accordingly. Unless the attitudes of voters change, and/or people who want this to change but don't vote in municipal elections start voting, no amount of "think of the children" signs will ever make a dent in the situation. And, while we're at it, slapping a 40 kmh (or whatever American equivalent) sign on a wide straight "residential street" where you can comfortably do double that speed without risking a trip to the body shop is about as effective.
Physical re-design and effective (preferably automated) speed enforcement. Nothing else works, no point wasting steel and paint.