Pierce County established a Traffic Calming Pilot Program in 2005, to evaluate the effectiveness of speed humps as a method of traffic calming on local roads. Two neighborhoods were initially selected for installation of temporary speed humps. These speed humps were installed in 2006.
In the months following their installation, the overall effectiveness as well as the public's receptiveness was evaluated by way of before and after speed/volume studies and neighborhood surveys. These results were provided to the County Council for further direction. Subsequently, permanent speed humps replaced the temporary humps in these two neighborhoods in 2007. In 2008, two more neighborhoods were selected for the Traffic Calming Pilot Program and were fitted with several speed humps.
In addition to the speed humps, the County also installed 12 driver feedback signs on arterial roads as a part of the Pilot Program. The effectiveness of these electronic signs in slowing arterial traffic has been mixed, primarily due to equipment reliability issues.