• The inductive loop sensor device for vehicle detection for the present invention comprises :

Composite Inductance Loop:

• Contains large outer loop (portion A) and a small inner loop (portion B)

Detection Means:

• Inductance of both the outer loop (A) and the inner loop (B) changes when vehicles pass over the loop.

1. The device consist of multiple composite inductance loops (Lp) connected to the detection means.
2. Both the outer loop (A) and inner loop (B) are described as having multi-layered multi-turn windings, and the composite loop (Lp) consists of these loops connected in series.
3. The detection means is connected to alternative loops at any specific instance, which helps to activate either odd or even number loops using a switching means, thereby reducing cross-sensitivity effects between neighboring loops.
4. The detection means is designed to analyze the relative timing and sequence of detection signals in the composite loop (Lp) to determine the direction of vehicle travel and the speed of the vehicle based on the duration of detection signals
5. The composite loop (Lp) is placed transversely to the traffic flow direction in the roadway and can classify the vehicles too.
6. The detection means is also adapted to detect the number of parallel movements of multiple vehicles on the roadway by analyzing signals from the composite loops.
7. For example the relative change in inductance noticed will be sufficient enough to detect the object reliably such that outer loop is mainly sensitive to large objects and inner loop is sensitive to small vehicles.