 Some have attempted to withstand the summit's sub-zero temperatures in shorts and flimsy sandals. Starting today, only 4,000 people a day will be permitted onto the Yoshida Trail, Mount Fuji's most popular path. And a gate halfway up will close after 4 p.m. It's aimed at turning away those who try to hike overnight to reach the peak at sunrise, the same group that often require the most emergency medical attention.