What is the main function of electronic eyes without fill lights?

[OCarson]

Electronic eyes without fill lights work by recording videos. Introduction to electronic eyes: Currently, the most commonly used devices for capturing traffic violations in cities are electronic cameras. Electronic cameras can monitor vehicles in real-time within the surveillance area. When a vehicle commits violations such as running a red light, driving in the wrong direction, or crossing the line, the electronic camera will continuously capture multiple images of the process. How electronic eyes work: Electronic eyes use induction loops to sense the pressure from vehicles on the road. The sensors collect signals and send them to the central processor, which temporarily stores the data in a register (this data is valid within one red light cycle). If two pulse signals are generated simultaneously within the same time interval, it is considered "valid." Simply put, if the front wheels cross the line during a red light but the rear wheels do not, only one pulse is generated. No photo is taken unless there are two consecutive pulses.

[MatteoDella]

Actually, these non-flashing electronic eyes are mainly used during the day. I pass by several of them every day on my way to work and found they primarily do three things: catching those who cross solid lines to change lanes, specifically photographing those who cut in line at intersections, and monitoring no-U-turn zones. Last time, I saw three cars at an intersection being continuously photographed for crossing solid lines, and the electronic eye didn't even flash once. However, after dark, they basically stop working since without supplementary lighting, they can't clearly capture license plates. So, nighttime DUI checks still rely on mobile devices with flashes. It's better to drive carefully when passing by such cameras during the day—don't think you won't be caught just because there's no flash.

[JuniperRose]

This type of electronic eye is particularly adept at speed detection and capturing violations. My relative in the traffic management department mentioned that the latest camera models can accurately measure speed without using flashes, making them especially suitable for installation in tunnels and areas with heavy tree shade. They take three consecutive photos and calculate the vehicle's speed using induction loops, capable of clearly capturing even speeding motorcycles. Although their performance is slightly reduced at night, they still function effectively on well-lit roads. Here's an interesting fact: many of these electronic eyes can now also detect unbuckled seat belts. Last year, my colleague was caught this way—the ticket photo was taken without a flash but was remarkably clear.

[Tyler]

The primary function is actually all-day monitoring of illegal parking. The electronic surveillance camera at the entrance of my residential community is this type, keeping a 24-hour watch on no-parking zones. Once when I dropped someone off and parked for just 2 minutes, I received a ticket on the third day, with the photo even clearly capturing the relocation contact number on the car window. A traffic police friend mentioned that these cameras come with infrared night vision, capable of capturing illegal parking even at midnight, making them far more efficient than issuing paper tickets. During the day, they also double up to photograph vehicles occupying bus lanes, and now they can even identify delivery e-bikes riding on motor vehicle lanes, covering a broader range than those flashing electronic surveillance cameras.