CFMCamera and FCD-Based Traffic Management Algorithm
Manage Junctions Based Not Only on Current Density, but on the Entire Road Network
CFM is an advanced traffic management algorithm that jointly uses real-time data obtained from traffic scene analytics cameras and vehicle movement data known as Floating Car Data (FCD).
Conventional methods generally rely only on sensor data around the junction or on predefined traffic programs. CFM, however, evaluates the immediate traffic conditions near the junction together with speed and travel time information from road sections approaching the junction. By enabling a higher level of coordination between junctions, it reduces stop-and-go movements and travel times and creates a more orderly traffic flow.
Camera- and FCD-Based Traffic Management Algorithm
CFM is a traffic management algorithm that combines camera-based traffic data and FCD data within a common decision structure. The system does not make decisions solely according to the number of vehicles on the junction approach; it also evaluates average travel time, average vehicle speed, speed variations, traffic flow conditions, queue formation, and movements between junctions on the road sections connected to the junction.
This means that management decisions incorporate not only the junction’s current condition, but also the traffic demand moving toward the junction and the overall performance of the corridor. Through its integrated data structure, the system measures current density, tracks flow on approach roads, determines travel times between junctions, detects queues and speed reductions, switches between coordinated and isolated management, and adjusts signal cycles according to current conditions.
From data to signal, step by step
Ecosystem Connection
CFM capabilities
CFM combines camera and FCD data within a single decision structure, extending from the immediate junction area to the road-network scale.
Key Features
Why CFM?
Manages the junction not only according to current density, but according to all traffic conditions approaching it.
Advantages
CFM combines camera and vehicle movement data within a common decision structure to improve junction and corridor performance together.
Frequently Asked Questions
What does CFM do? +
CFM jointly evaluates real-time junction data from traffic cameras and FCD-based speed and travel time information to manage junctions and traffic corridors.
Which data does CFM use? +
The system can use vehicle count, stop-line passage, occupancy rate, average speed, travel time, road segment condition, and queue information.
What area does the camera data cover? +
Traffic scene analytics cameras are used particularly to evaluate real-time traffic conditions within an area of approximately 100 meters near the junction.
How is FCD generated? +
Location, speed, and travel time information obtained from vehicles moving on the road network is matched with road segments, and segment-based average speed and travel time values are generated.
How long are the FCD segments? +
Depending on the project and road network structure, segments can be evaluated as road sections of approximately 50 meters.
How frequently is FCD updated? +
Depending on the project infrastructure, data can be updated every minute.
Can CFM determine queue length? +
Camera data and speed reductions in FCD segments can be evaluated together to determine queue formation and an approximate queue level on approach directions.
Does CFM directly operate the traffic signals? +
CFM generates operating mode and signal timing decisions. These decisions are transferred to the junction controller through MANGO and CENTRIS; the traffic signals are operated by the junction controller.