6.8 References

American Public Transportation Association. (2024, March). 2023 public transportation fact book. https://www.apta.com/wp-content/uploads/APTA-2023-Public-Transportation-Fact-Book.pdf

Bureau of Transportation Statistics. (2022, January). Public road and street mileage in the United States by type of surface. U.S. Department of Transportation. https://www.bts.gov/content/public-road-and-street-mileage-united-states-type-surfacea

Peeples, M. (2023, November 27). U.S. airlines lose 2 million suitcases a year. Where do they end up? [Radio broadcast transcript]. NPR. https://www.npr.org/2023/11/27/1215336777/u-s-airlines-lose-2-million-suitcases-a-year-where-do-they-end-up

Perez, M. (2024, October 14). The role of transportation in the development of tourist activity. Smartvel. https://www.smartvel.com/resources/featured/the-role-of-transportation-in-the-development-of-tourist-activity

Send My Bag. (2025, January 29). Lost luggage issues cost the airline industry $2 billion each year. https://www.sendmybag.com/en-us/press/releases/lost-luggage-issues-cost-the-airline-industry/

U.S. Centers for Disease Control and Prevention. (2024, November 19). About transportation safety. U.S. Department of Health and Human Services. https://www.cdc.gov/transportation-safety/about/index.html

U.S. Environmental Protection Agency. (2024, June 18). Fast facts on transportation greenhouse gas emissions. https://www.epa.gov/greenvehicles/fast-facts-transportation-greenhouse-gas-emissions

U.S. Travel Association. (2025). Economic impact of the U.S. travel industry: 2024 national data. https://www.ustravel.org/sites/default/files/2024-03/National%20Data_0.pdf

Washington State Ferries. (n.d.). About us. Washington State Department of Transportation. Retrieved May 29, 2025, from https://wsdot.wa.gov/travel/washington-state-ferries/about-us; archived on June 1, 2025, at https://web.archive.org/web/20250601061955/https://wsdot.wa.gov/travel/washington-state-ferries/about-us