Yes, save 20K / yr in mundane, everyday traffic fatalities, the kind where our usual response is:
1. what a tragedy!
2. what was the driver/cyclist/pedestrian doing wrong?
3. why wasn't there better enforcement?
Here's a positive, workable approach that has resulted in a traffic fatality rate that's half of ours, called Vision Zero or Sustainable Safety, depending on the country where it's been implemented (with subtle differences).
Warning - it involves lower vehicle speeds - heresy, I know.
http://www.northeastern.edu/peter.furth/wp-content/uploads/2015/06/Sustainable-Safety-for-Boston.pdfJerry