
As long as there is no no U-turn sign or a separate U-turn signal, and only a left-turn arrow is present, motor vehicles can make a U-turn without affecting normal traffic flow and ensuring safety. Typically, the central median on general roads changes from a solid line to a dashed line near intersections, allowing vehicles to make a U-turn in this area. Situations where U-turns require observing traffic signals: If there is a U-turn signal at the intersection, you must wait for the U-turn green light to proceed. If there is no no U-turn sign at the intersection and there is a crosswalk, you must wait for the left-turn signal to turn green and cross the stop line before making a U-turn. If the road centerline is solid or blocked by barriers like railings and there is no dedicated U-turn lane, you must wait for the left-turn signal to turn green before proceeding. Situations where U-turns do not require observing traffic signals: If there is a single-sided yellow dashed line at the intersection, placed before the stop line, you can make a U-turn at the dashed line without waiting for the signal. It is important not to obstruct normal traffic flow during the U-turn. If there are barriers like railings with a dedicated U-turn lane before the intersection, you also do not need to wait for the signal. If there is a U-turn sign at the intersection with accompanying text indicating that no signal is required, you can make a U-turn directly at the intersection.

I've been driving for ten years and have seen many intersections like this. It's true that you can make a U-turn when the left-turn arrow is green, but only if there's no 'No U-turn' sign or solid lines on the road. Once, I was driving in a new district where the left-turn signal was green, but there were double solid yellow lines on the ground, so I didn't dare to make a U-turn. However, the experienced driver behind me just crossed the solid lines and made the U-turn, which was actually a violation. Also, pay attention to intersections where the U-turn area is very close to the crosswalk—you must wait for pedestrians to cross first. Rules can vary by city. For example, in Shanghai, some traffic lights have a dedicated U-turn indicator, which is the most straightforward. In short, don't solely on the left-turn signal for U-turns; you need to pay attention to road signs, markings, and real-time traffic conditions.

When I first got my driver's license last year, I was also constantly troubled by this issue. The instructor taught me that a green left-turn arrow means you can turn left or make a U-turn, but in practice, it's not that simple. I remember once at a mall exit, the left-turn light was green, but there was a 'No U-turn' sign at the entrance, and I almost violated the rule. Now, I pay more attention to three things: first, the auxiliary signs next to the traffic light; second, the arrow markings on the road; and third, the gestures of traffic assistants. Some lanes allow U-turns when a regular circular green light is on, but a left-turn arrow light gives clearer guidance on when to make a U-turn. Additionally, if there are guardrails or green belts separating the intersection, forcing a U-turn is particularly dangerous—these details are most easily overlooked by beginners.

This issue actually depends on the specific situation. A left-turn green light usually indicates that a U-turn is permitted, but some cities may temporarily prohibit U-turns during morning rush hours. I always make it a habit to quickly scan my surroundings before making a U-turn: checking for circular signs with diagonal lines above, whether the road markings are dashed or solid lines, and if there are oncoming vehicles in the opposite lane. Special attention should be paid when the left-turn lane is on the far right—such unique designs might prohibit U-turns. Just the other day in the development zone, I encountered such a road setup, and thankfully, I noticed the arrow markings on the ground. Extra caution is needed when driving at night, as some old intersections may have prohibited signs obscured by tree branches. In summary, traffic signals are just one reference factor; actual decisions should be based on real-time road conditions.

From a traffic regulation perspective, a left-turn arrow green light generally permits U-turns, but there are several exceptions to note. First, U-turns are prohibited when there are no U-turn signs or textual warnings ahead. Second, U-turns cannot be performed across double solid yellow lines. Third, certain special road sections, such as school entrances, may prohibit U-turns during specific time periods. I recommend observing the position of the left-turn lane before making a U-turn. If there is a dedicated U-turn gap, you can proceed without waiting for the left-turn signal. Additionally, in rainy or foggy conditions where visibility of pedestrians on crosswalks is poor, it's best to refrain from making a U-turn even if the light is green. Last month, I encountered an oncoming vehicle speeding through a yellow light, and fortunately, slowing down my U-turn speed helped avoid an accident.

This issue is particularly relevant during morning and evening rush hours. I commute daily and need to make U-turns at three intersections with left-turn signals. From experience: U-turns can be made when the left-turn arrow turns green, but if there's a queue of left-turning vehicles blocking the way, you might have to wait for another green cycle. Some traffic lights optimize timing for U-turn needs – for instance, at newly built intersections in our area, the left-turn green light flashes rapidly during the last five seconds to alert drivers. Also, remember to use your turn signal when making a U-turn; many beginners assume small turns don't require signaling. Last week during heavy rain, a car suddenly made an unsignaled U-turn, nearly causing a rear-end collision. Additionally, if the left-turn lane has a U-turn arrow marking, the operational permissions become clearer.


