Elephant Underpass, Kenya, Africa,

In the Philippines, it can be seen in the city of Makati and some places in Manila, such as in Quiapo and near the Manila City Hall, commonly known as "Lagusnilad."
Subways used to be widely built in countries with moderate technological advancement but with highly awkward traffic science such as the Soviet Union. As most of these countries retained their traffic science awkwardness but at the same time collapsed in terms of technology and public finances, cheaper overground passages are getting more widespread there.
Subways may also be constructed for the benefit of wildlife.