Men who can't control their "hirhurim" when they see a woman should be the ones taking an alternate route home. That'd be the "tzanu'a" thing to do. But this is far more about power than it is about "tzeniut".
Russia: U.S. plan to provide air cover for Syrian rebels undermines Damascus fight on ISIS (Reuters)
from the article: Mea She'arim to ban women from certain Jerusalem streets during Sukkot