License plate readers have become a familiar part of everyday physical security and access control. What started as a specialized law-enforcement tool is now used on toll roads, in parking garages, at gated entrances, and throughout city infrastructure to quickly identify vehicles at scale. As LPR technology shows up in more places, people are asking tougher questions about how accurate it is, who’s watching over it, and what it means for privacy. This article explains how these systems work, where they are commonly used, what data they collect, and why they are still important in ongoing legal and ethical discussions. Key Takeaways - License plate readers (LPRs) are fast cameras that take pictures of license plates, record the time, and note the GPS location of the reader, creating a timestamped location record of the vehicle - Law enforcement uses LPRs to find stolen cars, locate people with outstanding warrants, and help with criminal investigations. Commercial operators use them for toll collection, parking management, and controlling access to areas. - Collecting a lot of license plate data raises important privacy and civil rights concerns, especially when this data is kept for a long time or shared beyond where it was collected. - LPR systems collect data on billions of vehicles, documenting the movements of individuals who are not connected to any criminal activity. This increases concerns about the surveillance capabilities these systems can provide. - The actual accuracy of LPR systems is often lower than what vendors claim. Their performance can vary greatly depending on environmental factors and conditions. What Is a License Plate Reader (LPR/LPR/ANPR)? A license plate reader is a surveillance technology designed to automatically capture and interpret vehicle registration plates from images or video footage. These systems go by several names: LPR (License Plate Reader), LPR (Automated License