Its definitely been hit and miss, in SE Portland you really can see which neighbors ponied up, as the city asked residents to fund part of the cost of the speed

Its definitely been hit and miss, in SE Portland you really can see which neighbors ponied up, as the city asked residents to fund part of the cost of the speed bumps added in parts of SE to reduce through traffic speed. Hence why some are literally bumps atop a bump, cause the house directly beside it paid a non-negligible portion of the cost of that there speedbump!