 The cameras are used to capture the license plate number of every car, and a security system automatically notifies local police if the captured number is recorded in a database.Travelers are notified of the presence of the system with signs that read "You Are Entering a 24 Hour Video Surveillance Area"; according to Medina's police chief, all captured information is stored for 60 days even if nothing negative is found in the database, allowing police to mine data if a crime occurs later.One of the city's council members said the system was motivated by the belief that the need for crime prevention "outweighs concern over privacy".