young, inexperienced motorists. In some jurisdictions, points can also be added if the driver is found to be significantly at fault in a traffic accident. Points can be removed from a driver's score by the simple passage of time, by a period of time with no violations or accidents, or by the driver's completion of additional drivers' training or traffic safety training. Major traffic offenses, such as hit and run or drunk driving may or may not be handled within the point system. Such offenses often carry a mandatory suspension of driving privileges, and may incur penalties such as imprisonment. Jurisdictions that use a point system Australia Traffic laws are the responsibility of the Australian state and territory governments. Demerit points schemes have been adopted by all states and territories, and road authorities share information about interstate offenses. In all states, drivers holding a full, unrestricted license will be disqualified from driving after accumulating 12 demerit points or more within a three-year period, except in New South Wales, where drivers are allowed 13 points in a three-year period. Those who can prove they are professional drivers are allowed an additional point. The licence suspension period is three months, plus one further month for every extra four points beyond the threshold, with a cap in most states of five months (for 8 points or more over the threshold; e.g. 20 points or more on a full license). As an alternative to accepting immediate suspension, a driver can apply for a "good behavior" period of 12 months. In most states, drivers under a good behavior period who accumulate one or two further points (except in Victoria, which does not allow any further offences) have their licence suspended for double the original period. Most states also provide for immediate suspension of a licence, instead of or in addition to demerit points, in certain extreme circumstances. These generally include offences for driving under the influence (DUI) of alcohol or other drugs, or for greatly excessive speed. New South Wales Provisional licence holders are allowed to incur different numbers of points, depending on their licence class, before their licence is suspended for three months. Holders of a P1 licence, which lasts 12–18 months (which can be renewed), can incur 4 points, and P2 licence holders can incur 7 points in a 24- to 30-month period (which can be renewed). Speeding offences for provisional licence holders