Because more people live in cities than ever before and more value is being put on having quality sleep and quiet. Cities need to be transformed in to the nicest places to live to lower housing costs and help the environment. One of the most impactful things that can be done is catching the very tiny percent of people causing basically all the noise. It should also be in the hands of the people who live there. If you want to drive through an area, you should be subject to measures set by the people of that area.
