Officers may use ALPR to automatically identify or track individual vehicles in real-time by adding a license plate to a "hot list" License plates are also applied to hotlists when the car is stolen or connected with a warrant that is pending. Some companies are using these hotlists to raise money by avoiding scofflaws seeking citations. Some hotlists include misdemeanors at low levels and traffic offenses. If the ALPR camera scans a plate on the list, the device will send a warning to the officer in the squad car (if it is a mobile reader) or to the department (if it is a fixed reader). Police officers will set up their own hotlists, too. Law enforcement authorities will also preload a list of license plates actively searched for by the ALPR system - such as stolen vehicles and vehicles registered with expired warranties. Several firms run independent ALPR systems that are non-law enforcement, negotiating with drivers to install cameras on private vehicles to capture the details. These data are then sold to companies like insurers, but law enforcement can also purchase access to this commercial data on a subscription basis. Law enforcement agencies can access data collected by other law enforcement agencies through regional sharing systems and networks run by those private companies without their own ALPR systems. Police departments manage the databases but they are also managed by private firms. Much of this ALPR data was stored for long periods of time in databases - often as many as five years. Having a camera is like a deputy sheriff standing at the intersection where the cameras are, seeing the license plates, and immediately knowing if there's a vulnerable person, a wanted person. Using video footage, license plate readers can drastically reduce the time it takes to find a suspicious vehicle linked to criminal activity. An automatic license plate reader can tell the intimate story or your travels. The functionality of license plate readers allows law enforcement to use many eyes and complex analytics functions. Law enforcement agencies may opt to communicate with thousands of other agencies about their knowledge. Vendors suggest police may use the information gathered to figure out where a plate was in the past, to determine if a car was at the scene of a crime, to recognize travel habits, and even to locate vehicles that could be connected to each other. The data, which includes photographs of the vehicle and sometimes its driver and passengers, is then uploaded to a central server. ALPRs automatically capture all identifiable license plate numbers, along with location, date, and time. One vendor praises that its dataset contains more than 6.5 billion scans and rises every month at a rate of 120-million data points.Īutomated license plate readers (ALPRs) are computer-controlled high-speed camera systems usually placed on street poles, streetlights, highway overpasses, mobile trailers, or connected to police squad cars. They could pick up thousands of plates per minute. Some devices are capable of capturing vehicle make and model. Images, dates, times, and GPS coordinates can be stockpiled and can help place a suspect at a scene, aid in witness identification, pattern recognition, or the tracking of individuals.Īutomatic License Plate Readers - ALPR' s collect license plate numbers and location details, along with the exact date and time that the license plate was located. In addition to the real-time processing of license plate numbers, ALPR systems in the US collect (and can indefinitely store) data from each license plate camera. ALPR is becoming a significant component of municipal predictive policing strategies and intelligence gathering, as well as for recovery of stolen vehicles, identification of wanted felons, and revenue collection from individuals who are delinquent on city or state taxes or fines, or monitoring for "Amber Alerts". Over 66% of all US police departments use some form of ALPR. Automatic License Plate Readers or ALPR is used among US law enforcement agencies at the city, county, state, and federal levels.
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