Subway!

[Lynne Murphy]

Using the excuse of this subject heading to point out another US/UK
distinction:

If you see a sign in London marked 'subway' with an arrow pointing down,
it's pointing to a walkway under a road or train track.  It's not
pointing you the way to the Tube.

Lynne

Dr M Lynne Murphy
Lecturer in Linguistics
School of Cognitive and Computing Sciences
University of Sussex
Brighton BN1 9QH
UK