U-turns are not permitted on tidal lanes unless there is a sign explicitly allowing it. Tidal lanes are a type of variable lane, and the tidal markings on both sides of the road serve the same purpose as double yellow lines. When driving, motorists must not cross the tidal markings to overtake another vehicle or make a U-turn. Violators will be fined 100 yuan and receive 3 penalty points under the Road Traffic Safety Law. Additionally, when driving on a tidal lane, motorists must pay attention to the direction indicated by the traffic signals. Generally, tidal lanes are operational only during specific times, such as morning or evening rush hours, or when there is heavy traffic in left-turn lanes and lighter traffic in straight lanes. Outside these designated times, motorists are not allowed to use the tidal lane. Circumstances where U-turns are allowed: U-turn permitted with clear signage: If an intersection has a clear U-turn sign, motorists can make a U-turn. If there is a U-turn traffic light, they must follow its instructions. In the absence of a signal light, U-turns can be made as long as they do not obstruct other vehicles or pedestrians. U-turn allowed if not explicitly prohibited: If there are no signs explicitly prohibiting U-turns or left turns, motorists can make a U-turn. "Not explicitly prohibited" means the intersection has no "No U-turn" or "No Left Turn" signs, and the center line is not solid. In such cases, U-turns are permitted. U-turns allowed on yellow grid lines: Yellow grid lines are no-stopping zones, typically marked at intersections prone to congestion due to temporary stops, entrances/exits of important facilities, or other critical locations. Stopping on these lines (including waiting for traffic lights) is a violation. However, while stopping is prohibited, U-turns are allowed on yellow grid lines as long as there is no central barrier, effectively making them "U-turn permitted" zones. U-turn allowed with a U-turn signal light: If there is a dedicated U-turn signal light, motorists must wait for the green light to proceed. U-turn allowed despite no left turns: If signs permit U-turns but prohibit left turns, U-turns are still allowed. Note that "No U-turn" and "No Left Turn" are not the same. Things to note when making a U-turn at an intersection: Check road markings: If the line is solid, U-turns are strictly prohibited under any circumstances. Motorists should continue driving to find a suitable spot. No U-turn if left turns are prohibited: If there is a "No Left Turn" sign, even without a "No U-turn" sign, U-turns are not allowed because the maneuver involves a left turn. U-turns must be made from the innermost left-turn lane: If the vehicle is in the second left-turn lane, U-turns are not permitted at that intersection. Yield to straight-moving traffic: U-turns must not interfere with vehicles going straight; otherwise, the U-turning driver bears full responsibility for any accident. Lane arrows matter: Near stop lines, lanes often have directional arrows. If the leftmost lane has a straight arrow instead of a left-turn arrow, U-turns are prohibited even without explicit "No U-turn" signs. No U-turns on crosswalks: Making a U-turn on a crosswalk is also a traffic violation.
