Do Traffic Lights Measure Speed?
3 Answers
Traffic light cameras can measure speed. Additional information is as follows: 1. Electronic Eye: Uses induction lines to sense the pressure transmitted by vehicles on the road, collects signals through sensors to the central processor, and temporarily stores them in registers. Within the same time interval (red light cycle), if two pulse signals are generated simultaneously, it is considered "valid." Simply put, if the front wheels cross the line during a red light while the rear wheels do not, only one pulse is generated. If there are no two consecutive pulses, no photo is taken. When the yellow light is on, the photo system is delayed by 2 seconds before activation. When the red light is on, the system is already active. When the green light is about to turn on, the system shuts down 2 seconds in advance, mainly to prevent false captures. 2. There are four types of speed cameras: fixed speed cameras, mobile speed cameras, average speed cameras (interval speed cameras), and hidden speed cameras.
Traffic lights themselves do not measure speed; they simply control the traffic signals, directing vehicles when to stop and when to go. The red and green lights you see at intersections have straightforward functions—preventing collisions and ensuring orderly traffic flow. However, many places have cameras installed near traffic lights specifically to monitor speeding or running red lights. When I drive, I always remind myself to stay within the speed limit, especially at intersections—never hit the gas to rush through. Speeding can easily lead to accidents and may also result in fines. Safe driving is the top priority; following the rules protects both yourself and others. It’s also a good idea to regularly check your vehicle’s lighting system during maintenance.
Traffic lights are solely responsible for signal switching and do not have built-in speed detection capabilities. However, from a technical perspective, modern traffic systems often integrate cameras or radar devices near traffic lights to monitor speed. These devices automatically capture vehicle speed data, as seen in some urban smart traffic projects. While driving, don't take traffic lights lightly; maintaining a steady speed is safer and reduces accident risks. I've seen advanced equipment that can analyze the coordination between vehicle speed and signals, so developing the habit of slowing down when approaching ensures a smoother and safer journey.
