How about not having a 40 or 50 mph speed limit on a residential street?
For example all of the things nickspacek mentions here would be brought in in due course based on pressure from the drivers themselves: https://news.ycombinator.com/item?id=16107645
Legal driving does not mean I have the ability to repeal basic physical laws like inertia. If you're trying to legislate cars off the road altogether, then this is probably one way to do it, but good luck with the general program.
No, that is not how you build a culture. :)
The road should not have had such a high speed limit, should have had speed bumps, and possible the little boy's parents should have had a fence.
Punishing the driver in this case doesn't fix the problem at all.
In this particular case, there is one thing that stands out to me above all others: the mailboxes were on the opposite side of the road from the houses. The second thing that distressed me was that the cop, after investigating and deciding there was no reasonable suspicion that the driver was criminally culpable, went on to lecture the driver anyway.
The road should have had a high speed limit, with no speed bumps. And there should have been no reason for pedestrians to ever set foot on it. Those mailboxes were on the wrong side of the road, because the postmaster decided that the driver on that rural route should not have to turn around twice or exit their vehicle to service those addresses. That boy died to save $300 in postal employee wages per year.
The homes should have had a gravel frontage road--behind a guardrail, bollards, cable, or Jersey barrier--with the mailboxes on the same side of the main road as the buildings.
And the cop should not have been lecturing anybody. That's the judge's job. No arrest? That means no judge, and no lecture. "Here's the number of the guy we called out to tow your vehicle, and the department's photocopied resource list of local businesses that may be helpful to you today, in the aftermath of your incident. I can give you a ride back into town, where you will have an opportunity to give a written statement for the accident report. Then you can use one of the payphones in the lobby to call somebody."
Well, for one thing, putting rural mailboxes on the same side of high-speed roadways as the houses they serve would seem to be an obvious mitigation, though it would probably have some additional mail delivery costs.