Moving Backward: A Look at Mehadrin Bus Lines
There was no Rabbi more concerned with tseni'ut (modesty) than R. Moshe Feinstein. He was against men shaking a woman's hand even as a polite greeting (IM OH 1:113; EH 1:56). Even in circumstances when the law didn't strictly prohibit the mingling of men and women, he encouraged God-fearing people to avoid such situations.