Undoubtedly, the hottest topic these past couple of days has been the legendary yellow traffic light supposedly invented by a Chinese person in the United States. At the start of this year, our country officially enacted and implemented a law that, for the first time, clearly defines the use of yellow lights and the corresponding penalties (previously, the yellow light was indeed a gray area — some treated it as a green light to accelerate, others as a red to brake). Currently, the role of the yellow light leans more toward that of a red light — stop. If a vehicle fails to stop and crosses the stop line after the yellow light is illuminated, the driver will face severe penalties including a fine and the deduction of half the points on their driver’s license. It’s easy to imagine that such a clear, one-size-fits-all regulation will inevitably attract widespread attention and strong dissatisfaction from motorists. All kinds of opinions and questions have flooded the internet.
Actually, the crux of the debate isn’t whether the “warning” signal is a yellow light or something else. Its function is to inform drivers who haven’t yet crossed the stop line that there is a fixed amount of time before the signal turns red. Drivers must then consider the road conditions, their speed, and the distance to the intersection stop line to decide whether to proceed or brake. This is what’s known as the buffering effect. No matter how slow the speed, drivers need reaction time upon seeing the signal, and once they react and begin braking, the vehicle still requires a certain braking distance. If the driver judges that the braking distance is greater than the distance from the front of the car to the stop line when braking, their choice will naturally be to switch from braking to accelerating, in order to get through the intersection quickly to avoid crossing the line, rear-ending, or causing congestion. Conversely, they may choose to brake, or even accelerate through — under previous laws, as long as the front of the vehicle had crossed the stop line by the time the red light came on, it was considered legal.
This buffering effect can be achieved by the yellow light, a flashing green light, or even a countdown timer on the green light. As long as drivers are given a clear signal — that there is a predictable amount of time before the stop signal — they can make a judgment. If both braking distance and acceleration time allow, the freedom of choice is entirely granted to the driver.
In our country, whether it’s government advocacy or the current traffic situation, when encountering a buffering signal at an intersection and both options are physically feasible, the tendency is still to brake. The sole reason is the prevalent presence of non-motorized vehicles and pedestrians who cross intersections regardless of the signal. Even when proceeding on a green light, drivers must slow down and stay alert, ready to respond to pedestrians (or non-motorized vehicles) crossing horizontally. Accelerating when the light turns yellow significantly increases the likelihood of vehicle–pedestrian (or non-motorized vehicle) accidents.
Therefore, in situations where pedestrians and non-motorized vehicles cannot be controlled, the freedom of choice that the yellow light grants to drivers is forcibly taken away. The government now requires drivers to uniformly treat the yellow light as a stop signal. In practice, this regulation leads to two scenarios:
1. As mentioned above, if there are other warning or buffering signals besides the yellow light — such as a flashing green light at the end of the green phase, or a countdown timer on the green light — drivers still have a buffer period, albeit slightly earlier, and the duration of the stop signal is longer (red + yellow). However, in cases where drivers believe that conditions such as speed, timing, and distance allow them to pass through the intersection, they can still accelerate and cross before the yellow light comes on. This means the problem remains entirely unresolved.
2. If there are no other buffering signals, drivers are left in a completely perplexing situation. Because they don’t know when the signal might suddenly turn into a “stop,” and stopping immediately when the stop signal appears requires the driver’s reaction time to approach zero and their speed to also approach zero. Clearly, this is against physiological and physical laws. As a result, we then see drivers becoming overly cautious even when facing a green light — either driving extremely slowly, causing congestion, or slamming on the brakes when the yellow light suddenly appears, leading to rear-end collisions. — But the benefit is that it will undoubtedly greatly reduce vehicle–pedestrian (or non-motorized vehicle) accidents, and significantly lower the casualty rate in traffic incidents.
Ultimately, the issue with the yellow light stems from many pedestrians and non-motorized vehicles not obeying traffic rules and not following the signals designated for their direction of travel. But we still shouldn’t place the root cause on the “quality” or “law-abiding awareness” of pedestrians and non-motorized vehicle drivers. The vast majority of people fundamentally understand and are willing to follow traffic rules. However, the currently tense and scarce road resources put people in a dilemma. Often, due to large numbers of people crossing the road simultaneously, or many vehicles coming from the opposite direction, or traffic signal durations being too short, people simply cannot get through smoothly if they strictly follow the signals — at the very least, they’ll lose a lot of time. When weighing the choice between obeying the law and personal interest, phenomena like “Chinese-style jaywalking” emerge. After all, pedestrians generally face no consequences for breaking the law.
“Cars don’t yield, so pedestrians can’t cross; if you yield to pedestrians, you can’t cross yourself” — this is the most direct and common reflection of scarce road resources in our country. Under such circumstances, no group can achieve both efficiency and full compliance with the law. The introduction of the yellow light rule is merely a signal of the intensifying conflict over road resources. The government’s stance is to forcibly reduce the travel efficiency of all drivers, incurring significant economic losses — including congestion, vehicle collisions, and fines paid by drivers — in exchange for fewer pedestrian casualties. However, the first scenario mentioned above has little to do with this regulation. Only if all buffering signals across the country were eliminated would the ultimate intent of this regulation be realized. But in that case, traffic would become unimaginably inefficient and economically costly.
