Buying a new cheap car is the safest, and I'm sure there are always some models available under 20K.
Poor people (or even non-poor people) can buy the cheapest transportation available. US used to have the cheapest cars in the world. Its completely changed now, all you need to do is to ask your administrators to let the manufacturers from China bring them in.
1) They can buy a cheap car that will cost nothing in fuel. This is the worlds cheapest SOLAR CAR: https://www.youtube.com/watch?v=Hk6aTKV-des
2) They can buy EV KEI cars (https://insideevs.com/news/807141/byd-racco-kei-driven-japan...)
3) They can ask for biking trials to be built. Atlanta seems to have built many miles of connected trials.
4) EV Golf carts are a perfectly acceptable form of transportation: https://www.bloomberg.com/features/2023-golf-cart-kingdom/
Ask your admin to allow cheap cars/KEI/golf and work with your local city to build walk/bike/golf-cart trials. Its a one time cost, you can make transportation cheap permanently.