Is there a sin upon a passenger standing in a bus if the bus exceeds the legally permitted capacity?

If standing in public transportation leads to harm, such as the person standing falling or harming others through crowding, then it is not permissible, especially if the person standing is a woman who would be subjected to degradation and proximity to men's bodies. As for necessities, they are judged according to their extent, such as transporting people during disasters and wars.