
Tunnels are equipped with electronic captures. The speed limit in highway tunnels is 60 to 80 kilometers per hour. Changing lanes or overtaking is prohibited while driving in tunnels due to the limited space and poor lighting conditions, which can easily affect the normal driving of other vehicles. Moreover, tunnels are now equipped with comprehensive camera capture systems, and illegal lane changes will result in a 3-point deduction and a fine. Relevant details are as follows: 1. Speed limit signs: When drivers see that they are about to enter a tunnel, they should observe the speed limit signs on both sides of the road in advance. If using navigation, it usually provides an early warning about the speed limit in the upcoming tunnel, prompting drivers to slow down and maintain a safe distance from the vehicle ahead. 2. Turning on headlights: Before entering a tunnel, drivers must turn on their headlights and keep them on until the vehicle has completely exited the tunnel. This is because the sudden dimming of light upon entering the tunnel can cause a temporary 'blindness' effect, making it difficult to adapt to the suddenly darkened environment. Therefore, headlights should be turned on before entering the tunnel to reduce visual conflicts.

I've noticed that many tunnels are equipped with electronic monitoring systems, especially those long tunnels on major highways, which typically have cameras to monitor speeding or violations. For example, mountain tunnel entrances often have such devices installed nearby, though not all tunnels do. Small tunnels in remote areas or short tunnels on rural roads may lack these systems due to budget constraints or low traffic volume. With years of driving experience, I always maintain a cautious speed in tunnels—safety first. Checking is simple: look for warning signs at the entrance or use navigation app alerts. Remember, tunnels pose higher risks, such as sudden light changes that can cause accidents. Even without monitoring, rules should be followed. Regular maintenance of vehicle lights is also crucial to ensure visibility to others.

From a technical perspective, the application of electronic surveillance in tunnels primarily depends on safety design and regulatory requirements. High-speed or urban core tunnels are often equipped with advanced systems, including radar and AI cameras, for real-time traffic monitoring and accident prevention. However, not all tunnels have such systems. For example, simple mountain tunnels may lack equipment due to high costs or maintenance difficulties, which are key reasons. I usually rely on my dashcam to observe road condition alerts to avoid speeding risks. Tunnel surveillance is also linked to local policies, with higher prevalence in large cities but less on small highways. It's advisable to check map app warning settings in advance to enhance safety. The installation of these systems mainly aims to reduce congestion and accident rates, as tunnels are high-risk road sections.

In the past, speed cameras were rarely seen in tunnels, and safety relied on self-discipline. However, significant changes have occurred in recent years, with many areas now equipped with surveillance, especially in newly constructed highway tunnels where speeding cameras are common. Not all tunnels have them; for example, older tunnels may still rely on manual patrols. I always drive slower in tunnels due to poor lighting, which can easily lead to problems. Developing good habits and following the rules helps avoid tickets. Understanding regional differences is also important.


