The 4 Steps for Kids are:
While most infants and toddlers ride in the correct child safety seat, less than 10 percent of the children who should be in booster seats use one. The National Highway Traffic Safety Administration (NHTSA) recommends that children who have outgrown child safety seats be properly restrained in booster seats in the back seat until they are at least eight years old, unless they are 4'9" tall. A booster seat lifts a child up so that a safety belt can fit correctly. Without a booster seat, a small child can be ejected from a vehicle during a crash.
There is only one station within Metro Louisville.
http://www.nhtsa.dot.gov/cps/cpsfitting/index.cfm