Questions & Answers about bié zài zhège lùkǒu zhuǎnwān.
别 is used to make a negative command: don’t ...
So:
- 别转弯 = Don’t turn
- 别在这个路口转弯 = Don’t turn at this intersection
It is not the same as 不.
- 不转弯 usually sounds like a statement: not turning / won’t turn
- 别转弯 is an instruction or warning
A close alternative is:
- 不要在这个路口转弯。
That also means Don’t turn at this intersection, but 别 is shorter and very common in spoken Mandarin.