Single Lane Post Classification AVC System

The TDS classification systems combine a side mounted tracking laser (Scandar) and an overhead mounted laser profiler to automatically classify vehicles into user defined categories (autos, trucks, buses, motorcycles, etc.). The system utilizes pattern recognition for class differentiation.


Data from the profiling scanner is used to form a matrix depiction of the vehicle as seen from the overhead position of the laser. The vehicle classification process is initiated when careful examination of the profiling scanner output indicates the presence of a vehicle. During periods when no vehicle is being detected by the laser scanner, the processor periodically polls the laser scanner looking for any indication of a vehicle presence. When the profiling laser is penetrated, the processor uses velocity information from the Scandar to determine the position of the vehicle relative to the initial location point set by the profiler. Based upon this position, the profiler is polled at regular predefined distance intervals (as opposed to time). A complete set of data points is transmitted to the signal/data processor at each sample distance. From this information a vehicle profile is generated. This process continues until the profiler no longer contains any indications of a vehicle. At that point the vehicle profile is terminated.

The real time flow of data from a treadle or a side mounted laser scanner provides for the determination of axle distances from the front edge of the vehicle. The length of the vehicle is determined from the number of individual data sets that are recorded. A treadle based dual tire detector can also be added to the system in the event that dual tires play a role in the classification scheme.

Send us your class table and we will recommend a system configuration to meet it.

Actual Profile - Single Lane Laser Automatic Vehicle Classifier System

The functional capabilities of the various models are shown in the following table. All systems include Scandar and use one or more overhead laser(s) for separation and width detection. Axle detection is provided by a fiber treadle or a side mounted laser scanner.

Model Number Overhead Lasers Length Width Profile Height Profile Axle Detection Dual Tire Detect
210 1 Yes Limited Yes Treadle No
220 1 Yes Limited Yes Treadle Yes
230 1 Yes Limited Yes No No
240 2 Yes Full Yes Treadle No
241 2 Yes Full Yes Treadle Yes
242 2 Yes Full Yes No No
250 2 Yes Full Yes Laser No