Traffic calming gets neighbors fired up as much as the trash service changing their schedule unannounced.
Traffic calming exists to help you, the human being. When a local government builds something that’s a little calmy, it might not slow down vehicles as intended. Depending on the location, you might need much more than one little calming ingredient.
Check this site out for detailed information about how traffic calming improves walking and bicycling conditions: http://www.pedbikeinfo.org/planning/facilities.cfm.
And check this site out for design ideas: http://safety.fhwa.dot.gov/speedmgt/traffic_calm.cfm.