In certain states, an individual's drivers license can be suspended if that person has a significant amount of outstanding debt. In Tennessee, more than 90,000 drivers licenses have been suspended in the last four years alone. A majority of the people who have lost their licenses live in rural areas and have no access to public transportation.
See "Driver?s License Suspensions Create Cycle of Debt", Shaila Dewan, The New York Times, April 14, 2015