1990 CTPP--SUMMARY LEVELS AND GEOGRAPHIC CODES USED IN PART 3
(Universe: Persons living or working in the CTPP region)


Asterisks indicate which codes will appear on the records for each summary level. 

---------------------------------------------------------------------------------------------------------------------
    |                         |       CODES SHOWN IF ORIGIN IS INSIDE REGION        |   IF ORIGIN IS OUTSIDE REGION   
RES |                         |-----------------------------------------------------|--------------------------------
SMLV|                         |      STUDY                    MSA/                  |       MSA/                     
CODE|SUMMARY LEVEL DESCRIPTION|REGION AREA CBD ST COU MCD PLC CMSA PMSA TRACT BG TAZ|Region CMSA PMSA ST COU MCD PLC 
---------------------------------------------------------------------------------------------------------------------
                              |                                                     |
950  CTPP Region              |  *                                                  |  *               *  *   
960  CTPP Region-MSA/CMSA     |  *                             *                    |  *     *        
965  CTPP Region-CMSA-PMSA    |  *                             *    *               |  *     *    *       
980  CTPP Region-Study Area(1)|  *     *                                            |  *               *  *   
990  CTPP Region-TAZ          |  *                                                * |  *               *  *  (2)  *
992  CTPP Region-State-County-|                                                     |
       MCD-Place/Rem.-Tract   |  *             *   *   *   *              *         |  *               *  *  (2)  *
994  CTPP Region-State-County-|                                                     |
       MCD-Place/Rem.-Tract-BG|  *             *   *   *   *              *   *     |  *               *  *  (2)  *
---------------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------------
    |                         |     CODES SHOWN IF DESTINATION IS INSIDE REGION     |   IF DEST. IS OUTSIDE REGION      
WORK|                         |-----------------------------------------------------|--------------------------------
SMLV|                         |      STUDY                    MSA/                  |        MSA/        
CODE|SUMMARY LEVEL DESCRIPTION|REGION AREA CBD ST COU MCD PLC CMSA PMSA TRACT BG TAZ|Region CMSA PMSA ST COU MCD PLC
---------------------------------------------------------------------------------------------------------------------
                              |                                                     |
950  CTPP Region              |  *                                                  |  *               *  *   
960  CTPP Region-MSA/CMSA     |  *                             *                    |  *     *        
965  CTPP Region-CMSA-PMSA    |  *                             *    *               |  *     *    *       
980  CTPP Region-Study Area(1)|  *     *                                            |  *               *  *   
984  CTPP Region-CBD(1)       |  *          *                                       |
990  CTPP Region-TAZ          |  *                                                * |  *               *  *  (3)  *
992  CTPP Region-State-County-|                                                     |
       MCD-Place/Rem.-Tract   |  *             *   *  (3)  *              *         |  *               *  *  (3)  *
994  CTPP Region-State-County-|                                                     |
       MCD-Place/Rem.-Tract-BG|  *             *   *  (3)  *              *   *     |  *               *  *  (3)  *
---------------------------------------------------------------------------------------------------------------------

(1) These summary levels were created only if requested, and may not be present in some CTPPs.                   
(2) Except in five states. In FL, NE, TN, TX, and WA the MCD of residence field has been zero-filled.
(3) Only in the nine Northeast states: CT, ME, MA, NH, NJ, NY, PA, RI, VT. Otherwise the MCD of work 
    field is zero-filled.



Flow records provided in Part 3:

Res   Work 
SMLV  SMLV  Type of Flow    
----  ----  --------------------------
950   950   Region to Region
960   960   MSA/CMSA to MSA/CMSA
965   965   PMSA to PMSA
980   980   Study Area to Study Area

-Only one from following three SMLVs-
990   984   TAZ to CBD
992   984   Tract to CBD
994   984   Block Group to CBD

-Only one from following three SMLVs-
990   990   TAZ to TAZ 
992   992   Tract to tract
994   994   Block Group to Block Group



----------------------------------------------Abbreviations Used----------------------------------------
BG   - Census Block Group                               PLC  - Place (incorporated or census designated)
CBD  - Central Business District                        PMSA - Primary Metropolitan Statistical Area
CMSA - Consolidated Metropolitan Statistical Area       Rem. - Remainder of area (COU  or MCD)
COU  - County                                           ST   - State
MCD  - Minor Civil Division                             TAZ  - Traffic Analysis Zone
MSA  - Metropolitan Statistical Area
