YOU SAID:

We have to go over a dangerous mountain road in winter, which makes it less safe.

INTO JAPANESE

冬は危険な山道を越えなければならず、安全性が低下します。

BACK INTO ENGLISH

In winter, you have to cross dangerous mountain roads, which reduces your safety.

INTO JAPANESE

冬には、危険な山道を横断する必要があり、安全性が低下します。

BACK INTO ENGLISH

In winter, you have to cross dangerous mountain roads, which reduces your safety.