The lack of respect for the speed limits?That does happen. The question is still what problem did you solve by creating a new problem?
We have a residential street close perpendicular to mine that runs parallel to lakeshore road.. anytime the highway got backed up, lakeshore would get jammed, and people would start using this sidestreet to get where they need to get to. Thing is commuter traffic would speeeeeed through that residential area (40km/h), used to just be 2 lanes, then 2 lanes with "markings to slow down" people. Didn't work. So they put speed bumps all across the 1.5 km every 200m or so
My aging car doesn't enjoy it but it's working.