What are the rules for three lanes merging into two lanes?

[LaArabella]

For two lanes in the same direction, the left lane is the fast lane, and the right lane is the slow lane; for three or more lanes in the same direction, the leftmost lane is the fast lane, the middle lane is the travel lane, and the rightmost lane is the slow lane. On highways and fully enclosed first-class roads, the leftmost lane is often designated as the overtaking lane. Below is more detailed information: Content 1: Motor vehicles driving in the fast lane should adhere to the speed limit set for the fast lane. If they cannot reach the designated speed, they should move to the slow lane. Motorcycles should drive in the rightmost lane. If there are traffic signs indicating speed limits, drivers should follow the posted speed limits. When a vehicle in the slow lane needs to overtake the vehicle in front, it may temporarily use the fast lane. Content 2: On roads with two or more motor vehicle lanes in the same direction, vehicles changing lanes must not affect the normal driving of vehicles in the adjacent lanes.