annotated bibliography
http://www.oregonlive.com/commuting/index.ssf/2018/01/trimet_to_hire_portland_patrol.html
https://www.thoughtco.com/how-safe-is-public-transportation-2798815
https://mta.maryland.gov/transitblog/ten-ways-be-safe-and-feel-safe-public-transportation-4
https://www.portlandoregon.gov/police/article/529197