If you observe closely, you will notice that women sit near other women on public transport to minimise the risk of being harassed or attacked. Being mindful of their safety they always locate where they will be less threatened.
#2:. Women are usually conscious when alone
No woman likes to be seen at the receiving end, especially when she is alone. Whenever, a woman is alone she carries a key in her hand as a “weapon”. For her to feel a bit secured when walking alone at night, her little weapon helps.