Karl covers it pretty well. When the "E.", "W.", "N." or "S." appears before
the street, it can be considered part of the street name and usually identifies
part of the street on one side of a boundary. For example, all street numbers
in Chicago start with 0 at State and Madison. If you go east, you're on East
Madison and the numbers start going up. If you go south, you're on South State
and the numbers are going up. Thus, you can always tell which way you're
going: If you're on W. Washington Blvd. and the numbers are going up, you're
going west.
Unfortunately, many cities don't follow such a common-sense strategy.
In the case of a direction coming at the end of the street name, I've seen that
when the street is divided by a median of some kind, and traffic goes in
opposite directions on either side of the median. Then again, these might also
be identified by "North" and "South" simply telling you the relationship of the
two halves, as in this Los Angeles example:
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=north+venice+blvd.,+venice,+ca
Gavin
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