
One solid line and one dashed line allow lane changing. In road sections with one solid line and one dashed line, the side with the solid line prohibits crossing the line or overtaking, while the side with the dashed line permits lane changing and overtaking. The primary purpose of this marking is to facilitate vehicle diversion, alleviate traffic congestion, and prevent large-scale accidents. Precautions for changing lanes in motor vehicles are as follows: Situations where changing lanes is not allowed. When encountering situations where changing lanes is not permitted during driving, follow the traffic flow. While continuing to drive with the traffic flow, pay special attention to other traffic conditions and cautiously return to the originally planned route. When changing lanes to avoid obstacles, perform the lane change appropriately in advance. Prevent vehicles in adjacent lanes from affecting the lane change, which could lead to braking, stopping, or forcing a lane change, resulting in a collision accident. When changing lanes, avoid abruptly turning the steering wheel into the adjacent lane to prevent collisions with suddenly appearing vehicles or vehicle skidding due to slippery road surfaces. Lane changes should not be too slow. Driving for long distances while straddling the line can affect other vehicles. Generally, lane changes should be completed within a distance of 50-60 meters.

When driving, I often encounter road markings with a solid line on one side and a dashed line on the other, which are common in both urban areas and highways. If you're driving on the side with the dashed line, you're completely allowed to change lanes or overtake—the dashed line indicates this permission. However, if you're on the side with the solid line, never cross it, as the solid line signals that lane changes are prohibited. Once on the highway, I overlooked this rule and nearly caused a rear-end collision. Since then, I always signal early, check the mirrors, and ensure safety before changing lanes. Beyond following the rules, I also recommend slowing down in bad weather and avoiding lane changes on curves or during peak hours to prevent tickets or accidents. My driving experience has taught me that these small details can significantly enhance road safety and make journeys smoother.

As a new driver, I was initially intimidated by these lines when I first started driving. But my driving instructor taught me: when a solid line and a dashed line coexist, if you're in the lane on the dashed line side, you can legally change lanes or overtake; if you're on the solid line side, don't move. The dashed line is like a pass, indicating you can cross, while the solid line is a strict barrier. I've now developed the habit of first signaling left or right, gradually accelerating to check for vehicles behind me, and then maneuvering within a safe distance. Everyone should review traffic manuals or online videos to deepen their understanding, practice lane-changing skills in open road sections, and develop good habits to avoid penalties and collisions. Behind these simple rules lies safety logic that protects both yourself and others.

In traffic regulations, this solid-dashed line design is used to distinguish lane permissions. The dashed side allows vehicles to cross the line for lane changes, as dashes represent flexibility; the solid side prohibits any lane changes or overtaking to maintain safety and order. It commonly appears on curved roads or busy sections to prevent blind-spot accidents. Particularly applicable on highways—if you're on the dashed side, you can change lanes but remember to signal and check mirrors; the solid side requires strict compliance. In practice, it's best to assess road conditions before acting and avoid attempting maneuvers in rain or at night. Familiarity with these rules helps avoid unnecessary fines—easily dodging that ¥200 penalty and demerit points.
