Traditional spot speed cameras measure speed at a single point. Many drivers slow down just before the camera and speed up again afterward, which limits the safety benefit. Section control, also known as average speed enforcement, addresses this behavior by measuring how long a vehicle takes to travel between two or more points.

Cameras at the start and end of a section read license plates and record precise time stamps. The system calculates each vehicle's average speed over the distance. If the average exceeds the limit, a violation is recorded. Because drivers cannot avoid detection by braking briefly, compliance improves along the entire section, producing smoother traffic and fewer collisions.

What to Look for in a Section Control Supplier

Accurate time synchronization is the technical foundation. Every camera in the section must share a precise, traceable time source, typically through satellite time references, so that average speed calculations are reliable and legally defensible.

Plate recognition performance is equally critical. The system must read plates consistently at both ends of the section, in all lighting and weather conditions, and correctly match records even when traffic is heavy. High matching rates reduce lost cases and manual review.

Data protection deserves special attention. Section control systems record every vehicle, not only violators. Leading solutions process data on site or encrypt it immediately and delete records of compliant vehicles quickly, keeping only the information needed for enforcement.

Finally, consider flexibility. Good systems support multiple lanes, different limits for vehicle classes, variable speed limits and networks of overlapping sections. Experience with motorways, tunnels, bridges and urban corridors shows a supplier can handle diverse projects.

ISSD supplies section control and average speed enforcement systems with precise time synchronization, high-accuracy plate recognition and privacy-focused data handling. Road operators planning to improve safety on highways, tunnels or urban corridors can work with ISSD to design an effective average speed scheme.

Frequently Asked Questions

How is average speed calculated in section control?

The system divides the known distance between two camera points by the time the vehicle took to travel between them.

Is section control more effective than spot speed cameras?

It typically achieves higher compliance along the whole section because drivers cannot avoid detection by braking briefly.

What happens to data from vehicles that are not speeding?

Privacy-focused systems delete records of compliant vehicles quickly and keep only data needed for enforcement.