Summarize how the author describes a one-street mountainside neighborhood named Pasadena Glen.

When the author sees Pasadena Glen, a one-street neighborhood that winds its way up a mountainside along a steep canyon, he thinks of a bobsled run. He can see that living here offers a tranquil escape from busy city life. But he also sees the dangers the mountain poses. He sees the eroding mountain at the top of the neighborhood. The neighborhood itself resembles the track of a bobsled run. At the bottom, at the end of the run, is a debris basin. When it rains, boulders tumble down the mountainside.