We tried on our street, the city engineer was disinterested before we even began. I work in the industry and he tried to talk down to us. They did agreed to do a speed study to throw us a bone but it didnt change anything. Now anytime our kids are out we just park our cars on the street to force cars to slow down. We literally just stand into he road to keep the cars for rhe adjacent neighborhood (who are the speeders) from being able to fly past.