There's many resons why people would ride the bus....
a)They dont have a license, wheather they cant pass test, understand english or have had their privelges revoked.
B)Conveinence, not having to deal with traffic....
c)Although in Motown the most common reason is probably option A or they just cant afford one...By the time u buy a car, registration, emmisions, car insurance.....and pay the outrageous gas prices...the average american's salary doesnt let them afford rent, phone, gas, water, electricity....especially in some lower class part of Michigan....