when the route is safe, and all of this pertains to the obligatory ḥajj.

As for Shaykh al-Islām Ibn Taymiyya, al-Ikhtiyārāt records that he said, “Every woman who feels secure may perform the pilgrimage even without a maḥram, for the underlying cause no longer exists.” Abū al-ʿAbbās added, “This ruling applies to every journey undertaken for the sake of obedience.”

I say: The issue is one of juristic reasoning. Those who take the textual wording in its full generality act upon its plain sense and forbid such travel absolutely. Those who concentrate on the rationale for which travel was prohibited allow it in circumstances where doubt is remote and suspicion is minimal. The sounder view is what the Shaykh stated: it is permitted so long as safety is assured. A similar conclusion was mentioned earlier. Allah knows best.