What does the left three lanes and the right three lanes mean?

[VanWilliam]

Left three lanes refer to the three lanes on the left side of the entire road; right three lanes refer to any one of the three lanes on the right. The following is a related introduction about lanes: 1. Design basis: The structural standards of parking lots are the basic dimensions for design, including lane width, effective height under beams, turning radius of curves, slope of ramps, etc. To ensure smooth driving on curves, the effective width of a one-way lane should be designed to be at least 5m, and for two-way lanes, at least 5.5m. 2. Standards: The design hourly traffic volume coefficient K varies between 0.10 and 0.115. As for the allowable traffic capacity Ca for benchmark sections of various grades of highways, the values are taken based on research results from the Highway Research Institute of the Ministry of Transport.

[DakotaLee]

When driving on the road, you often encounter this situation. The so-called left three lanes refer to the fast lane on the left side of the road, usually used for overtaking. I prefer to stay in it when traffic is light, as it allows for higher speed, but you must be careful not to occupy it for too long, as it also tends to attract speeding vehicles. The three lanes on the right are mainly used for merging into the main road or as a slow lane for preparing to exit the highway. If you see an exit sign, switching to the right side in advance is safer to prevent sudden braking. The lanes are separated by white lines, and when changing lanes, always signal in advance, check the rearview mirror, and control the speed difference, especially during rainy or snowy days when skidding is more likely. The number of lanes may vary depending on the road width, so following the actual road signs is the safest approach.

[AbelAnn]

As a beginner on the road, I often got confused about lane divisions. Later, I figured out that the three left lanes usually refer to the left three lanes of multi-lane main roads, typically fast lanes. If you want to overtake, you should use these lanes, but you need to keep up with the traffic speed—going too slow can actually be dangerous. The three right lanes are for slower traffic or exit lanes, closer to the emergency lane and near entrances where cars often cut in, so I’m extra cautious about blind spot checks, especially adjusting the rearview mirror angle to avoid scratches. The key is to choose the right lane based on your speed. During the novice period, it’s good to get used to using navigation for assistance. Urban areas often have six-lane designs, and with a bit of practice, you’ll adapt to the traffic rhythm.

[SanCharlie]

From a road design perspective, these lanes are explained as follows: In traffic standards, the intention of the three left lanes is to provide efficient overtaking space and alleviate congestion. When driving, I flexibly switch lanes based on speed limits and traffic flow, avoiding prolonged occupation of the overtaking lane, as rules require yielding to faster vehicles. The three right lanes are often used for merging or deceleration exit zones, sometimes narrowing with potential risks, especially at night when lighting is dim, requiring early deceleration. Adhering to markings ensures safe distances, and this layout is commonly seen on highways in large cities.