Personally I don't like Helvetica, or Courier (which the New Jersey Rules of Court demand). And I do hate the 8 point internet protocol helvetica default. Don't like Verdana (like this), either. I like Times New Roman, Georgia, and other justified types. But, though purists may lament the MTA's occasional errors, you have to admit that those plain Helvetica fonts work well for subway signage.
Images: New York Times