What dirty method of getting from one place to another in large cities may not allow you to see daylight?\nOptions:\n- ground\n- subway\n- over bridge\n- street\n- race track
Let's be accurate as possible and think first.
subway
Subway is usually electric underground railway.

Subway, a dirty method of getting from one place to another in large cities may not allow you to see daylight.

.

Thus, the answer is subway