Safety and security is not the reason for a woman to need Mahram. Travelling itself is the reason that includes the requirement of Mahram. Majority of scholars say a Mahram is needed.
Although many others and Ibn Taimiyyah رحمه الله supported an opinion in the end of his life that women can travel without mahram if it is safe for them to travel with the permission of the Mahram.
Shaykh Waleed Basyouni answers and explains....
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