How Do Speed Cameras Work? A Simple Guide to Automated Enforcement

Speed cameras are becoming a key tool in communities’ efforts to reduce speeding, improve road safety, and protect vulnerable road users. But how exactly do they work? In this guide, we’ll break down the core technology behind automated speed enforcement, explain how violations are detected and processed, and help clarify the differences between various deployment options. Whether you’re a municipal leader exploring program implementation or a resident curious about how photo enforcement works, this article provides a clear, straightforward overview. 

What Is an Automated Speed Camera? 

A speed camera system is an automated setup that uses radar, LIDAR, or sensors to detect when a vehicle exceeds the posted speed limit. When a violation is detected, the system captures photographic or video evidence, which is reviewed by law enforcement before a citation is issued. 

These systems allow for 24/7, unbiased enforcement without the need for a police officer to be present at the scene. 

Core Components of a Speed Camera System 

Speed Detection Technology 

• Radar or LIDAR is used to measure a vehicle’s speed as it approaches or passes through the enforcement zone. 

• Detection can occur across multiple lanes and directions, depending on the system design. 

Imaging Equipment 

• High-resolution cameras are triggered when a violation occurs. 

• Systems typically capture images of the license plate, vehicle, and sometimes contextual surroundings (e.g., signage or roadway markings). 

• Some systems also capture short video clips of the violation for clarity. 

Automated Violation Processing 

• Once a vehicle is flagged for speeding, data (time, location, speed, vehicle info) is packaged along with the image or video. 

• This evidence package is reviewed and approved by authorized law enforcement personnel before a citation is mailed or digitally issued. 

What Triggers a Speed Camera? 

Speed cameras are programmed to activate only when a vehicle exceeds a pre-set enforcement threshold (e.g., 10 mph over the posted limit). The triggering conditions depend on: 

• Location policy (e.g., school zone vs highway) 

• Jurisdictional law 

• Camera type and programming 

Some systems use inductive loops in the pavement, while others rely solely on above-ground radar sensors. Either way, a speeding event must meet specific criteria before enforcement is triggered. 

Do Speed Cameras Flash? 

In some systems, a visible flash may occur at the time of capture, especially in low-light conditions. However: 

• Many modern cameras use infrared or no-flash imaging, especially in residential or school zones where distraction is a concern. 

• Flash presence and visibility vary depending on the manufacturer and lighting conditions. 

What Happens After a Violation Is Captured? 

Once a vehicle is detected speeding and the system captures the necessary evidence: 

1. The violation data is sent to a secure processing system 

1. Evidence is reviewed by trained personnel or law enforcement 

1. If validated, a citation is issued to the vehicle’s registered owner 

The entire process is designed to meet legal standards of proof and ensure accuracy and due process. 

Types of Speed Camera Deployments 

Verra Mobility offers three deployment types—each designed for different community needs and environments: 

Fixed Speed Cameras 

• Installed permanently at high-risk locations 

• Continuous, unattended enforcement 

• Ideal for school zones, intersections, and crash-prone corridors 

Transportable Speed Cameras 

• Designed for easy relocation 

• Useful for rotating enforcement zones, work areas, or seasonal priorities 

• Allows for targeted compliance efforts 

Mobile Speed Cameras 

• Mounted inside vehicles or trailers 

• Enables flexible, on-the-go enforcement 

• Supports patrol-style deployments and dynamic zone coverage 

Each deployment type uses the same core technology but offers different advantages based on location, policy, and enforcement goals. 

How Accurate Are Speed Cameras? 

Modern systems are highly accurate, with most using radar or LIDAR certified to meet strict performance standards. In addition: 

• Systems are routinely calibrated 

• Image timestamps and vehicle position are recorded precisely 

• Law enforcement review adds a human layer of verification 

Verra Mobility’s systems are built with accuracy, fairness, and legal compliance at the core of their design. 

Do Speed Cameras Issue Tickets Automatically? 

No. While detection and image capture are automated, all citations go through law enforcement review before issuance. This ensures that: 

• Only valid violations are cited 

• False positives or unusual circumstances are screened out 

• Legal and procedural oversight is maintained 

Some communities also implement educational warnings for first-time offenders before issuing fines. 

Learn More About Speed Enforcement 

Now that you understand how the technology works, explore these related resources: 

• Where Are Speed Cameras Legal? A State-by-State Overview 

• How Speed Cameras Change Driver Behavior Over Time 

• Top 7 Myths About Speed Cameras — Debunked 

Bring Automated Speed Enforcement to Your Community 

Verra Mobility helps cities, counties, and school districts deploy reliable, data-backed speed camera systems that work. Whether you need fixed installations or mobile flexibility, we’ll work with you to design a program that fits your local safety goals. 

Contact us to schedule a consultation or learn more about our speed enforcement solutions.