                            USER NOTE 02

The user notes shown below are current as of the end of 
August 1996 and relate to Parts 1 and 3 of the 1990
Census Transportation Planning Package. The first column gives
the region code of the area affected by the note, the second 
gives the name of the main city and state in the region, and
the third column describes the change, correction, or error.


Code  Name             Description
----  ---------------  -------------------------------------

All   All areas        An error was discovered in the
                       documentation for Part 3 of the CTPP,
                       concerning minor civil division (MCD)
                       of residence codes. The documentation
                       shows that in summary level 990, 992,
                       and 994 records, the full set of state,
                       county, MCD, and place of residence
                       codes are provided for trips
                       originating outside the region. This is
                       not true in five states. External trips
                       beginning in Florida (012), Nebraska
                       (031), Tennessee (047), Texas (048),
                       and Washington (053) have only state,
                       county, and place of residence codes.
                       The MCD of residence field has been
                       zero-filled in these records.

                       The documentation also fails to
                       indicate that for place of work
                       locations (internal or external), MCD
                       of work codes are only provided in the
                       nine northeast states (CT, ME, MA, NH,
                       NJ, NY, PA, RI, VT).


5345  Naples, FL       In the Part 3 data provided to the MPO
                       and State DOT, the minor civil division
                       (MCD) of residence codes were zero-
                       filled for trips originating inside the
                       region (summary level 994, or block
                       group, records). This is contrary to
                       what is shown in the documentation for
                       Part 3 and is different from Part 1,
                       where the MCD codes are present in the
                       data rather than being zero-filled.

                       The TransVU-CTPP software expects MCD
                       codes in the data and is unable to
                       access records where the MCD field is
                       zero-filled. Therefore, the Part 3 data
                       contained on the BTS-sponsored CD-ROM
                       discs has had codes inserted into the
                       MCD of residence field for trips
                       originating inside the Naples region
                       (Collier Co.). As noted above, trips
                       from other counties in Florida into the
                       Naples region will have zeros in the
                       MCD of residence field.


6440  Portland, OR     In the Part 3 data provided to the MPO
                       and State DOT, the minor civil division
                       (MCD) of residence codes were zero-
                       filled for trips originating inside the
                       region (summary level 992, or census
                       tract, records). This is contrary to
                       what is shown in the documentation for
                       Part 3 and is different from Part 1,
                       where the MCD codes are present in the
                       data rather than being zero-filled.

                       The TransVU-CTPP software expects MCD
                       codes in the data and is unable to
                       access records where the MCD field is
                       zero-filled. Therefore, the Part 3 data
                       contained on the BTS-sponsored CD-ROM
                       discs has had codes inserted into the
                       MCD of residence field for trips
                       originating in the Washington part of
                       the Portland region.

                       However, since the original data were
                       tabulated for whole tracts in Part 3
                       (rather than for MCD parts of tracts),
                       a complete correction was not possible.
                       In particular, Part 3 residence data
                       for tract 9501 in Klickitat Co. could
                       not be partitioned into the correct
                       three MCD parts. The tract is shown as
                       located only in MCD 006 in the Part 3
                       data on the BTS CD-ROM.

                       As noted above, trips from other
                       counties in Washington into the
                       Portland region will have zeros in the
                       MCD of residence field.


7840  Spokane, WA      In the Part 3 data provided to the MPO
                       and State DOT, the minor civil division
                       (MCD) of residence codes were zero-
                       filled for trips originating inside the
                       region (summary level 994, or block
                       group, records). This is contrary to
                       what is shown in the documentation for
                       Part 3 and is different from Part 1,
                       where the MCD codes are present in the
                       data rather than being zero-filled.

                       The TransVU-CTPP software expects MCD
                       codes in the data and is unable to
                       access records where the MCD field is
                       zero-filled. Therefore, the Part 3 data
                       contained on the BTS-sponsored CD-ROM
                       discs has had codes inserted into the
                       MCD of residence field for trips
                       originating inside the Spokane region.

                       However, since the original data were
                       tabulated for whole block groups in
                       Part 3 (rather than for MCD parts of
                       block groups), a complete correction
                       was not possible. In particular, Part 3
                       residence data for block group 1 in
                       tract 10 in Whitman Co. could not be
                       partitioned into the correct two MCD
                       parts. The tract is shown as located
                       only in MCD 105 in the Part 3 data on
                       the BTS CD-ROM.

                       As noted above, trips from other
                       counties in Washington into the Spokane
                       region will have zeros in the MCD of
                       residence field.


8725  Vancouver, WA    In the Part 3 data provided to the MPO
                       and State DOT, the minor civil division
                       (MCD) of residence codes were zero-
                       filled for trips originating inside the
                       region (summary level 994, or block
                       group, records). This is contrary to
                       what is shown in the documentation for
                       Part 3 and is different from Part 1,
                       where the MCD codes are present in the
                       data rather than being zero-filled.

                       The TransVU-CTPP software expects MCD
                       codes in the data and is unable to
                       access records where the MCD field is
                       zero-filled. Therefore, the Part 3 data
                       contained on the BTS-sponsored CD-ROM
                       discs has had codes inserted into the
                       MCD of residence field for trips
                       originating in the Washington part of 
                       the Vancouver region. As noted above,
                       trips from other counties in Washington
                       into the Vancouver region will have
                       zeros in the MCD of residence field.