I suggest going to www.rtk.net.  The data are NOT in MI format, but they 
are reasonably easy to import.  A word of CAUTION regarding the 
lat/longs.  Two other people and myself recently finished 2 papers that 
discussed the lat/long accuracy issue of TRI data in Brooklyn.  You 
definitely need to independantly confirm lat/longs.  While the data has 
gotten better over the years, it still needs alot of work.

Michael Branagan
USEPA, OP
401 M Street, SW
Washington, DC 20640-2123

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