Does highway violation surveillance include speed measurement?
4 Answers
Highway violation surveillance and speed measurement photography are not the same thing. 1. Different photography methods: Speed measurement photography uses high-speed, high-sensitivity cameras and flash with sensing devices. Induction coils are installed on the photography equipment, which automatically flash when a vehicle enters, indicating the detection of a vehicle. Surveillance photography uses conventional cameras, mainly for observing traffic flow and road conditions. To determine whether a vehicle is speeding, surveillance photography requires at least three or more photos as evidence. 2. Different purposes: Speed measurement photography aims to prevent speeding, while violation photography aims to prevent rule-breaking. On regular roads, speed limits of 70 and 50 are common, though drivers generally cannot speed in these areas. Many places have speed bumps for speed measurement. It's a good habit to slow down to below 70 upon hearing the alarm. When sensing a vehicle, the camera takes at least two photos—one of the front and one of the rear. If the photos are clear, they are automatically transmitted to staff for screening and processing. 3. Different camera principles: Speed measurement photography and surveillance photography use two different types of cameras. One is a regular camera for capturing lane violations, and the other is specifically for speed measurement. The speed measurement camera system is more expensive. From a cost perspective, not all surveillance cameras can measure speed, but speed measurement cameras have the functionality of regular cameras.
I used to pay close attention to these devices when driving on highways, so I can share some experience. Most electronic eyes on highways are equipped with speed detection functions, using radar or laser technology to monitor vehicle speed. Common setups include fixed speed cameras mounted on gantries, and nowadays, more and more sections use average speed measurement, calculating whether a vehicle is speeding by its average speed between two monitoring points. These devices operate 24/7 and can clearly capture license plates and the driver's cabin even in poor weather conditions. Once, while driving at night, I saw a flash, and later found out I was indeed caught speeding by 3 km/h. I recommend turning on the electronic eye alert feature in your navigation system, especially on unfamiliar roads where speed limit changes can easily be overlooked.
Having driven for over a decade, I've specifically studied highway surveillance systems. Most traffic violation cameras incorporate speed detection functions utilizing microwave radar or laser ranging technology. Fixed speed traps can accurately capture instantaneous velocity - for instance, triggering photos at 140km/h. Average speed checks over distance are even more sophisticated, like requiring 12 minutes to traverse a 20km section, with late arrivals recorded as speeding. These devices integrate with intelligent transportation systems, uploading data to police platforms in real-time. Special warning about concealed tunnel cameras - darker conditions actually enhance image clarity. Recommend maintaining 5km/h below posted limits since speedometer calibration variances exist.
As a long-haul driver, I've learned from experience: highway speed cameras are highly effective at detecting violations. They use radar waves to measure vehicle speed and automatically activate the camera when speeding occurs. Fixed-point cameras capture instantaneous speed, while average speed detection over sections provides more scientific measurement. The equipment can clearly capture license plates at night and performs well even in rainy or foggy conditions. Once I got caught on the Qingyin Expressway - the photo was so clear you could even see my seatbelt. I recommend paying close attention to changing speed limit signs, especially in construction zones where speed limits drop suddenly - that's when drivers are most likely to get caught.
