Your Drive Is Being Recorded: What Cameras Capture on the Road
A new state law is placing limits on how license plate reader data can be retained, shared and used, as open-source reporting indicates that at least 28 agencies and entities may already be operating the technology. The rules could affect how law enforcement tracks vehicle movements, including those of commercial trucks and professional drivers.
Law Sets 21-Day Retention Limit
The law establishes a general 21-day limit for retaining data collected by automatic license plate readers, although certain exceptions apply. It also restricts the sale or sharing of the information for purposes outside narrowly defined law enforcement activities.
License plate readers photograph passing vehicles, electronically identify license plate numbers and letters, and add the results to a searchable database. The systems can collect large volumes of information in a short period, including the time and location associated with each vehicle sighting.
For truck drivers and fleets, the retention limit creates a defined timetable for how long location records may remain available to authorities. However, the exceptions in the law mean some information may be preserved beyond the standard period under specified circumstances.
Systems Can Combine Multiple Data Sources
Modern investigative platforms can use license plate reader records alongside police files and commercial data. The systems may help investigators identify vehicles, locate repeated travel patterns and search for connections among vehicles observed at different locations.
One analysis of camera data found that a system recorded approximately 21 days of activity across several collection periods. During that time, the cameras photographed about 50,200 vehicles and generated roughly 1.6 million images. The images may capture more than license plates, including vehicles, bicycles and identifying details such as bumper stickers.
The individual camera is only one part of the system. Data from cameras in one community may be made available through broader networks to outside agencies, including police departments, universities and airports, depending on the agreements governing access.
Implications for Commercial Drivers
Because license plate readers can record vehicles without requiring a traffic stop, a truck may generate location data as it moves through areas equipped with the technology. Repeated observations can potentially create a record of a vehicle’s travel over time.
That information may be relevant to investigations involving stolen vehicles, criminal activity or missing persons. The new restrictions are intended to define how long the records can be kept and limit the circumstances under which they can be shared.
The law also comes as agencies and technology companies continue expanding the use of vehicle-mounted and roadside cameras. Unlike dash cameras used by drivers or fleets, license plate readers are designed primarily to identify vehicles and record where and when they were observed.
Data Governance Remains a Key Issue
The growing use of license plate reader networks has prompted questions about access controls, data retention and the ability of agencies to search information collected outside their own jurisdictions. The 21-day limit and restrictions on secondary use provide new standards for handling the records, but the applicable exceptions and agency policies will determine how the rules operate in practice.
