
Auxiliary roads do not allow left turns. Below are the precautions for driving on auxiliary roads: Overview: Entering the main road from an auxiliary road: If there is no traffic signal ahead on the auxiliary road, you can turn on the left turn signal, slow down, and merge into the main road. If there is a traffic signal ahead on the auxiliary road, you must follow the instructions of the traffic signal. When the traffic signal on the auxiliary road is red, you must stop before the stop line; when it is green, you can proceed left directly. Others: Merging from the main road into the auxiliary road: When driving on the auxiliary road, pay attention to the road signs, which usually include a yield sign (an inverted triangle with the word "yield"). When vehicles from the main road are merging, you must yield to the main road traffic first.

I've been driving for over a decade and have encountered the issue of left turns from auxiliary roads many times. Whether you can make a left turn mainly depends on whether there's a dedicated left-turn signal or signage at the intersection. If there's no prohibition sign, it's usually allowed, but you must yield to through traffic and not cut in. Having driven in different cities, like in Beijing where some auxiliary road intersections permit left turns while others strictly forbid them, I've developed the habit of slowing down early when approaching an intersection to observe surrounding signals and vehicles. Safety should always come first, especially during rush hours with heavy traffic or at night with poor visibility when left turns are more prone to accidents. I remember once nearly rear-ending someone because I didn't notice the speed of oncoming traffic while making a left turn from an auxiliary road. Additionally, in bad weather like rain when braking distances are longer, left turns require even more caution and stability. In short, act prudently within the rules and never gamble with luck.

Whether a service road allows left turns is actually guided by basic traffic regulations. In most areas, if there are no no-left-turn signs or traffic light controls at the intersection, left turns are theoretically permitted, but vehicles on the service road must yield completely to those on the main road. I always adhere to this principle while driving because the traffic flow on main roads is faster, and forcing a turn poses significant risks. Conditions vary across different road sections—for instance, service roads near highway exits often have left-turn prohibitions, while suburban side roads have fewer restrictions. I frequently use map apps in advance to plan routes and avoid uncertain left-turn points. Additionally, special attention must be paid to pedestrians, especially in school or residential zones, where left turns often involve blind spots. In summary, drivers should continuously observe roadside instructions, drive legally and safely, and avoid distractions like checking their phones.

Safety is my top priority when considering a left turn from a secondary road. If the intersection lacks signals or unclear signs, it's best to avoid turning left—waiting or taking a detour is safer. I've seen many accident reports involving improper left turns colliding with oncoming traffic. That's why I always stay alert when driving on secondary roads, slowing down and checking the rearview mirror before turning left to ensure no vehicles are approaching or there's enough distance. I also pay attention to nearby pedestrians who might suddenly appear. Driving at night or in foggy conditions is even trickier, as poor lighting can lead to misjudging vehicle speeds. Developing good habits helps: observe before acting, and never turn without signaling. This makes daily driving much more reassuring.


