YSK: As the driver of a motor vehicle, you are not being “nice” or “helpful” when you disregard conventional traffic flow to let someone go, you are creating traffic at best and causing accidents at worst.
from /r/YouShouldKnow
YSK：作为机动车驾驶员，当你不顾常规交通流让人时，不是 "好心"，也不是 "帮忙"，你最好是制造交通，最坏是造成事故。