Regulations Governing Road Traffic Safety
第二條
本規則用詞，定義如下：一、汽車：指在道路上不依軌道或電力架線而以原動機行駛之車輛（包括機車）。
Article 2
The terms used in this act are defined as below:
- Cars: refers to motorized vehicles that do not require tracks or power lines to travel on roadways (including motorcycles and motorized scooters).
第 101 條
汽車超車時，應依下列規定：
五、前行車減速靠邊或以手勢或亮右方向燈表示允讓後，後行車始得超越。超越時應顯示左方向燈並於前車左側保持半公尺以上之間隔超過，行至安全距離後，再顯示右方向燈駛入原行路線。Article 101
When performing an overtaking, the following rules should be observed:
5. Only when the vehicle in front has slowed and pull to the side of the road, or signaled for others to pass using hand gestures or right-turn signal, should the vehicle that’s following overtake the vehicle in front. While overtaking a vehicle, the driver should turn on the left-turn signal and keep a distance of at least half a meter from the left side of the vehicle being overtaken, and only to merge back into the lane after achieving safety distance.
Road Traffic Management and Penalty Act
Article 47
In the event of any of the following while overtaking other vehicles, car driver’s shall be fined from NT$1,200 to NT$2,400:
3. Overtaking vehicles from the right, failing to maintain proper distance while overtaking, or returning to the original lane before reaching a safe distance.
4. Overtaking a vehicle that does not indicate willingness to yield or moving to the side and slowing down.
Basically, if a scooter has been riding on the outer right half of the lane, and there is a 0.5m distance between the scooter and the vehicle being overtaken, it is actually not against the rule. However, if the scooter wasn’t on the outer right side to begin with, but was on the outer left side or in the middle of the lane, then cutting across the lane to the outer right side just to overtake the car in front would be considered as overtaking on the right hand side, which is against the rules.
So if those requirements are observed, then the vehicle in the back can not pass the vehicle in the front by “lane splitting”, which isn’t a thing in the rules. The only thing permitted is if the cars in the front have came to a stop, then scooters or motorcycles can move to the front even if they are unable to keep 0.5m from the stopped vehicles. However, if the vehicles in front are just slowing down, doing so is also against the rules.
That’s just my take of the rules, and it seems to match what this youtuber claims in Mandarin.
