(167) Chapter: The Desirability of undertaking a Journey in a Group and appointing a Leader

Ibn 'Umar (May Allah be pleased with them) reported:
The Messenger of Allah (ﷺ) said, "Were people to know of what I know about the dangers of travelling alone, no rider would travel alone at night."

[Al-Bukhari].

Commentary: Lonely travelling, whatever its form, is inadvisable at night and can cause many inconveniences. These inconveniences include deprivation of performing congregational prayers, feelings of loneliness and isolation and facing unexpected situations and damages. But the real reasons behind this prohibition, only Allah knows.