Things You Should Know About Inductive Loops For Traffic Detection

inductive loop detector

Inductive loops for traffic detection are vehicle detection loops that detect the arrival or passing of traffic at a specific point, such as heading towards a traffic light or motorway traffic. This heating is installed in electrically operated loop pavement. 

Inductive loops for traffic detection are either buried under the carriageway or mounted on signal heads. Induction loops never work by stopping the pressure of vehicles passing over them, but they do work by detecting metal objects passing over the loop. As they pass over the loops, it causes a change in the magnetic field that is created in the loop to take the car’s time to pass over the loop.


The Main Functions of the inductive loops for traffic detection:

  • If vehicles are on a high-speed pair of inductive loops for traffic detection, approach speed is determined, and then appropriate action is taken at the junction.
  • Loops are also used to call arrows indicating right turns. They detect vehicles waiting in the loops, which cause constant changes in the loop’s magnetic field.
  • The induction loop is not affected by any extreme weather conditions and is not obstructed by any overhanging objects. The type of detector is selected according to the site because not all site functions are the same.

Different Types and Lifetimes

For many years loop detector traffic has been a sensor used to detect various vehicles on the road. Still, now this loop detector traffic is used at intersections, driveways, parking lots, and vehicle gate systems with algorithms like SCOOT and SCATS.

 Placing these sensors on asphalt cutting and ground is a very important point. Because of this, the cost and performance of various sensors but these loop detectors are not known accurately. The traffic life of inductive loops for traffic detection is not more than one year due to poor quality of asphalt and damage due to heavy traffic on the road.

Why do traffic engineers use inductive loop detectors?

Various types of inductive loops for traffic detection are available. Among them, traffic engineers widely use inductive loop detectors due to their high accuracy and variety of applications. The most frequent inductive loop detector functions fall into six classes and are described below.

  • Isolated Intersection Control: Inductive loops for traffic detection can be used for isolated intersections to control traffic flow without considering the operation of adjacent road signals.
  • Arterial intersection control: Inductive loop detectors used in open arterial networks ensure traffic progress along a road by continuously displaying green signals for traffic flow.
  • Closed network control: In a closed network, inductive loop detectors coordinate a network of intersection signals within a specific area, such as a city’s central business district (CBD).
  • Area-Wide System Control: All traffic signals within an area will be treated as a single system in this type of system. Individual signals within these areas can be controlled using discrete intersection network concepts.
  • Priority Vehicle System Control: Inductive loop detectors help detect certain vehicles, such as ambulances, fire trucks, and buses, more continuously through busy intersections.

In addition, At busy intersections where pedestrians hardly have time to cross the signal, inductive loop detectors can be used on pushbuttons to give pedestrians the right of way.