
Intersection with yellow diagonal lines allows U-turns. Yellow diagonal lines, also known as yellow grid lines, prohibit all vehicles (including those waiting for traffic signals) from temporarily stopping within the grid area. However, the yellow grid lines indicate that parking is not allowed in this area, not that vehicles cannot make U-turns. Scenarios where U-turns are prohibited are as follows: U-turns are prohibited where there is a 'No U-turn' sign or 'No Left Turn' sign: If there is a sign prohibiting U-turns, then U-turns are not allowed at that intersection. The action of making a U-turn is an extension of a left turn, so if there is a sign prohibiting left turns at an intersection, U-turns are also prohibited there. U-turns are prohibited at crosswalks: U-turns are not allowed at crosswalks. If at an intersection where U-turns are permitted, you must cross the crosswalk before making a U-turn; you cannot make a U-turn on the crosswalk. U-turns are prohibited when there is no left-turn lane: Even if you are in the leftmost lane, if there is no sign permitting left turns, U-turns are not allowed. U-turns are prohibited within the second left-turn lane: When a vehicle is in the second left-turn lane, it cannot make a U-turn. In the absence of any signage, vehicles can only make U-turns from the innermost left-turn lane.

The yellow diagonal area is a traffic marking that allows temporary passage, so making a U-turn is theoretically acceptable. With twenty years of taxi driving experience, I've learned that the most crucial thing is to check if there's a no U-turn sign at the intersection. I've encountered drivers who only looked at the road markings and made a U-turn, only to be caught by a red prohibition sign in the middle of the intersection. Also, pay attention to the traffic light status—only proceed when the left-turn signal is green. Once, I didn't notice pedestrians while making a U-turn at a yellow diagonal intersection and almost hit an electric scooter running a red light. Take your time during the U-turn, turn the steering wheel fully, and yield to through traffic. If the intersection is too narrow or traffic is heavy, I'd rather take a detour for safety. Ultimately, the yellow diagonal line isn't an obstacle, but that doesn't mean you can ignore other rules.

Making a U-turn at an intersection with yellow diagonal lines requires case-by-case judgment. According to traffic regulations, yellow diagonal lines indicate a no-stopping zone, but allow vehicle passage. During my daily commute through such intersections, I mainly consider three factors: whether there's a no-U-turn sign, whether the traffic signal permits left turns, and whether there are left-turn guide arrows on the road surface. Once when I was in a hurry, I made a U-turn at a yellow-lined intersection without noticing a hidden prohibition sign and got penalized. I recommend slowing down in advance when driving in the left-turn lane to observe carefully. If oncoming traffic is heavy, I turn on my left signal to indicate my intention and confirm it's safe before completing the maneuver. The turning radius in yellow-lined areas is often large, so drivers of long vehicles like SUVs need to be extra cautious about scraping the curb.

The yellow diagonal area is essentially designed for temporary vehicle crossings, where U-turns are legal but with restrictions. As someone who rides motorcycles and drives cars regularly, I've deeply experienced the difference in visibility. When making a U-turn at a yellow diagonal intersection in a car, be mindful of the blind spot caused by the A-pillar—it's best to lean and check before turning. The key is to observe the traffic lights: U-turns are permitted when the circular red light is on, but must stop for arrow red lights. I remember once on a rainy day, making a sudden U-turn in the yellow diagonal area led to a rear-end collision. Now, I strictly adhere to three rules: check for no-U-turn signs, yield to through traffic, and never turn over pedestrian crossings. For motorcycle U-turns, extra caution is needed against electric bikes darting from the roadside, slowing down to under 15 km/h is advisable.


