Infractions

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An infraction, sometimes called a petty offense, is the violation of an administrative regulation, an ordinance, a municipal code, and, in some jurisdictions, a state or local traffic rule. In many states an infraction is not considered a criminal offense and thus not punishable by incarceration. Instead, such jurisdictions treat infractions as civil offenses. Even in jurisdictions that treat infractions as criminal offenses, incarceration is not usually contemplated as punishment, and when it is, confinement is limited to serving time in a local jail. Like misdemeanors, infractions are often defined in very broad language. For example, one state provides that any offense that is defined "without either designation as a felony or a misdemeanor or specification of the class or penalty is a petty offense" (see AZ ST § 13-602).
by (http://criminal.findlaw.com/crimes/criminal-overview/infractions.html)