[digibeet]

What about placing a fake speed camera? It might just get the job done

[rambambram]

What about just faking speed limit signs? If it's in The Netherlands, everybody should respect traffic signs, whether they are fake or not.

[Cthulhu_]

There will be speed limit signs, but they're easily ignored. Maybe one of these plastic "watch out for our kids" things that people place on the street themselves? https://verkeersmaatje.nl/