Wiktionary
traffic school
n. A place one can go to after they've had a traffic violation in order to get the points taken off their driver's license.
Wikipedia
Traffic school
Traffic school is the generic common term for remedial courses in Road-traffic safety and safe driving practices. In the United States, these are offered as part of pre-trial diversion programs to Moving violation offenders by traffic courts, in the interest of improving general safety. To offset the oppression suggested by the compulsory nature of traffic school, some businesses present themselves as a "comedy traffic school" where they attempt to have instructors who are, to some degree, entertaining.