Recently I visited a shopping mall located at the junction of two
roads (after being misled by Google Maps and travelling several km
because I searched for "City Centre" while the mall is called "Citi
Centre"... but that's a different story). The mall complex has two
gates for cars on the two different roads, one for cars to enter and
one for cars to exit. We happened to go to the wrong gate (exit gate),
and as a result had to go ahead and take a U-turn and go to the
entrance gate, while we could easily have gone to the entrance gate
directly if we had known in advance.
Such information is important (for car users at least), and should be
represented and displayed on the map.
This could be related to hierarchical features suggested long ago:
http://code.google.com/p/google-mapmaker/issues/detail?id=33