Why Commuting to the CBD?:
Why Commuting to the CBD? Measuring success of transit investments in terms of transit share of commute market.
Analyze trends in downtown employment & downtown as share of region.
Characteristics of employment density and transit market share: help to identify where transit will work / not work.
Extension to “Characteristics of Urban Transportation Demand” (CUTD)
Databases:
Databases US Decennial Census Journey-to-Work
1970 UTP
1980 UTPP
1990 CTPP
2000 CTPP, Part 2 (Forthcoming)
MPO/COG Estimates of Employment
MPO/COG Geographic Info. Systems
Auxiliary Information
Cordon Surveys
Chronology of Transit Investments, Buildings
CBDs in Cities….:
CBDs in Cities….
Issues:
Issues Employment vs Workers-at-Work
Ideally, CTPP workers-at-work is 90-93% of “jobs” due to multiple jobholding, weekly absenteeism, seasonal variation.
Multiple Definitions of Downtowns
“Core” versus “Greater” downtown.
Desire to have geographic consistency.
Difficulty in Finding & Using 1970 UTP, perhaps 1980 UTPP.
Prototype Analysis: San Francisco Bay Area:
Prototype Analysis: San Francisco Bay Area
Next Steps:
Next Steps Acquire CTPP 2000, Part 2 Data
Volunteer Effort
CBD Comparison Database
Write & Edit
Publish
Transportation Research Circular
Online Committee Report
Other Organizations (ULI, AMPO, APTA)
Contact: Chuck Purvis, MTC, cpurvis@mtc.ca.gov