In jurisdictions which use a point system, the police or licensing authorities maintain a record of the demerit points accumulated by each driver. Traffic offenses, such as speeding or disobeying traffic signals, are each assigned a certain number of points, and when a driver is determined to be guilty of a particular offence, the corresponding number of points are added to the driver's total. When the driver's total exceeds the prescribed threshold, the driver may face additional penalties, be required to attend safety classes or driver training, be subject to re-examination, or lose his/her driving privileges.