FAMA TRAFFIC | Smart transportation solution provider for 17 years.
Language
FAMA TRAFFIC | Smart transportation solution provider for 17 years.
Traffic lights rely on various digital sensors and inductive loops to detect vehicles and regulate traffic flow efficiently. These detection systems help ensure that vehicles waiting at intersections are recognized and that traffic moves smoothly. While both methods serve the same purpose, they function in distinct ways.
An inductive loop system involves embedding a wire loop in the road surface, typically installed by cutting a groove into the asphalt, placing the wire, and sealing it with a rubbery compound. These loops are often visible as rectangular shapes on the pavement.
Inductive loops operate by detecting changes in inductance. To understand this, consider a basic circuit with an inductor. Without the inductor, the circuit functions like a simple flashlight—when the switch is closed, the bulb lights up. However, with an inductor, the behavior changes. Initially, the coil resists current flow as it builds a magnetic field. Once the field is established, current flows normally. When the switch is opened, the collapsing field keeps current flowing for a short period.
A traffic light sensor continuously monitors the inductance of the loop. When a vehicle stops over it, the inductance changes, signaling the traffic system that a vehicle is present.
Reliable and low-maintenance compared to complex digital sensors.
Less susceptible to technical failures.
Can only detect the presence of a vehicle, not its speed or type.
May not detect lighter vehicles like motorcycles effectively.
Vehicles must be properly positioned over the loop to be detected.
Due to these limitations, some systems integrate additional sensors to enhance accuracy.
Beyond inductive loops, modern traffic lights use advanced detection technologies, often installed near the lights rather than embedded in the road. These include infrared sensors, microwave sensors, and video cameras.
Infrared sensors are available in two types: active and passive.
Active infrared sensors emit an infrared beam across an intersection. When a vehicle interrupts the beam, the system detects its presence. Emergency vehicles, such as ambulances and police cars, use these sensors to change lights when their sirens or lights are activated.
Passive infrared sensors detect the heat emitted by a vehicle’s engine. However, false readings can occur due to external heat sources, such as direct sunlight.
Microwave sensors work similarly to active infrared sensors but generate a magnetic field instead. When a vehicle enters the field, it disturbs the waves, allowing the sensor to detect its presence. These sensors are effective in all weather conditions and are less affected by heat interference compared to infrared systems. However, they are more expensive.
Video detection systems use cameras mounted on traffic lights to analyze real-time footage. These systems can:
Detect and count vehicles at intersections.
Distinguish between pedestrians and vehicles.
Connect multiple intersections to optimize traffic flow.
Data collected from these cameras can improve long-term traffic management and city planning. However, poor visibility conditions, such as fog or heavy rain, can reduce their effectiveness.
To ensure continuous and accurate traffic management, many intersections use a combination of detection methods, such as an inductive loop paired with a camera or infrared sensor. This redundancy ensures that even if one method fails due to environmental conditions or hardware issues, another system can take over, preventing major traffic disruptions.
Traffic light systems utilize various detection methods to manage road congestion and improve safety. While inductive loops remain widely used for their reliability, modern technologies such as infrared, microwave, and video detection are enhancing traffic efficiency. The integration of multiple detection systems ensures accurate vehicle detection and smooth traffic flow, contributing to smarter and more responsive urban infrastructure.
Contact Us
Phone: +86 18938689952
Email: sales3@traffic-lights.cn
WhatsApp: +86-18938689952
Skype: chevylight3
Add: Yangzhou: No 209, Tongxin East Rode, Wu'an town, Gaoyou, Yangzhou, Jiangsu, China. 225600 Shenzhen: 4F North, Building C, Fenda High-tech Park, Xixiang Street, Bao'an District, Shenzhen, China. 518126
We are confident to say that our customization service is outstanding.
Copyright © 2022 BOTTLE - aivideo8.com All Rights Reserved.
