"In the United Kingdom, the Republic of Ireland, Hong Kong and Commonwealth countries such as India, South Africa, Australia and New Zealand (but not commonly in ...
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Canada), a subway is normally an underpass for pedestrians and/or cyclists beneath a road or railway, allowing them to reach the other side in safety. Subways may also be constructed for the benefit of wildlife.
In the United States, as used by the California Department of Transportation and in parts of Pennsylvania such as Harrisburg, Duncannon and Wyoming County, it can mean a depressed road undercrossing." - (en.wikipedia.org 02.03.2020)