3-year Product3-year Product

June 2009June 2009

‘‘05-’06-’0705-’06-’07

20,000 people Zones20,000 people Zones

2000 Geography2000 Geography

Actual FlowsActual Flows

5-year Product5-year Product

June 2011June 2011

’’05-’06-’07-’08-’0905-’06-’07-’08-’09

Small AreasSmall Areas

New TAZsNew TAZs

Synthetic FlowsSynthetic Flows

Will there will be TAZs?Will there will be TAZs?

BaseBase

TAZTAZ

Traditional Traditional SizeSize

MediumMedium

TAZTAZ

4,000 4,000 populationpopulation

LargeLarge

TAZTAZ

20,000 20,000 populationpopulation

• Developed in late 2008 and Developed in late 2008 and early 2009early 2009

•All zones would nest within All zones would nest within each other and Countieseach other and Counties

•GIS approach to GIS approach to developmentdevelopment

•Funded under Consolidated Funded under Consolidated PurchasePurchase

Make sure to include staff time in Work ProgramMake sure to include staff time in Work Program

Comments Comments July 5, 2007July 5, 2007

For 2000 BG Minimum was 300 to 600 peopleFor 2000 BG Minimum was 300 to 600 peopleFor Tracts the Minimum was 1,500 peopleFor Tracts the Minimum was 1,500 people

Federal Register NoticeFederal Register Noticewww.census.gov/geo/www/psap2010/psapcriteria.htmlwww.census.gov/geo/www/psap2010/psapcriteria.html

TAZS

Discussions with CB for including TAZs in PSAP software-contracts in place

Research on Disclosure Completed--Final Decisions on TAZ sizes

PSAP--TAZ Info to States and MPOS--TAZs developed by States and MPOs

Verify and Review by CB

NOYES

Will the NEW Block Group criteria be Will the NEW Block Group criteria be applied to TAZs?applied to TAZs?

Should it apply?Should it apply?

Population and Worker Size Population and Worker Size Distribution of 2000 TAZs Distribution of 2000 TAZs

Average Population Per TAZ For Each Virginia Model Region

2,337

1,446

969

293

960

479416

535

361 352

0

400

800

1,200

1,600

2,000

2,400

2,800

North

ern

Virgin

ia

Hampt

on R

oads

Richm

ond T

ri Citie

s

Frede

ricks

burg

Roanok

e Val

ley

Lync

hburg

Charlo

ttesv

ille

Win

ches

ter

Black

sburg

Harris

onbu

rg

Model Region

Po

pu

lati

on

/ T

AZ

0.0%

20.0%

40.0%

60.0%

80.0%

Percent ARC Zones Above/Below Census Population Criteria (800 / zone)

Below Census Criteria 21.3%

Above Census Criteria 78.7%

Percentage of Zones

Resident TAZ Population 

Zero 10,548 6.3

1-49 14,210 8.5

50-99 7,912 4.7

100-199 13,014 7.8

200-499 28,770 17.3

500-749 17,773 10.7

750-999 13,813 8.3

1000-1999 32,682 19.6

2000-2999 13,831 8.3

3000-3999 6,588 4.0

4000-4999 3,418 2.0

5000+ 1,797 3.0

Workplace TAZ WorkersZero Workers 17,000 10.2

1-49 Workers 31,257 18.7

50-99 Workers 18,362 11.0

100-199 Workers 23,653 14.2

200-499 Workers 33,989 20.4

500-749 Workers 13,364 8.0

750-999 Workers 7,890 4.7

1000-1999 Workers 12,889 7.7

2000-2999 Workers 4,126 2.5

3000-3999 Workers 1,728 1.0

4000-4999 Workers 917 0.5

more than 5,000 Workers 486 0.9

Population and Worker Size Population and Worker Size Distribution of 2000 TAZs Distribution of 2000 TAZs