COG/TPB Transportation Analysis Zone (TAZ) Update Project Robert E. Griffiths Presentation to the TPB Scenario Study Task Force April 16, 2008 A brief overview of objectives Key objective- balance the needs of transportation modeling and forecasting future land activity (Cooperative Forecasting) Smaller zones around activity centers, transit, areas of increased or planned development Strive for uniformity in zone size throughout the COG/TPB Modeled Region,taking into account development patterns (present and future) Design a new zone structure that will be usable and meaningful until the next TAZ update (10-15 years historically) Rough estimate - double the current number of zones currently used; may vary by jurisdiction Example #1, continued Arlington County, VA 82 current TAZ, both COG/TPB and Arlington County Incorporate splits of existing zones provided by Arlington County; alignment with COG Regional Activity Centers where possible Proposed: 109 COG/TPB TAZ for Arlington County. This is an increase of 25 zones. Example #1, continued Ballston Metro Station Area For the Ballston Metrorail Station Area, the new TAZ system will break 2 current TAZs into 5 smaller ones The new TAZs will better delineate higher density mixed use zones from lower density residential areas Creates a new TAZ for Ballston Commons Example #1, continued Shirlington Also in the Shirlington area, the new TAZ will better delineate higher density mixed-use areas from lower density residential areas. Example #2 Prince Georges County, MD The current COG/TPB TAZ system for Prince Georges County has 381 zones Smaller zones inside the Beltway Larger zone sizes outside the Beltway The proposed, draft number of COG/TPB TAZs for Prince Georges County is currently 649 This is an increase of 269 zones for the county Example #2, continued Largo Activity Center Seventeen new smaller TAZs will used to better define the Largo Activity Center. Four new TAZs will be created in the immediate vicinity of the Largo Metrorail station from one large current TAZ. Example #3 Prince William County, VA Currently, there are 142 COG/TPB TAZs for Prince William County. The new proposed number of COG/TPB TAZs for Prince William County is 367 zones. This is an increase of 225 zones. Example #3, continued Innovation Activity Center The Innovation Activity Center in Prince William County is currently defined by only 3 large TAZs The 10 new TAZs for the Innovation Activity Center will better identify more concentrated areas of projected employment growth. New Data for New TAZs 2007 Household Travel Survey Spring 2007 Metrorail Survey Fall 2007 Air Passenger Survey Spring 2008 Regional Bus Survey Round 8 Cooperative Forecasts Project Schedule New TAZ Structure June 30, 2008 Geocoded Survey Data December, 2008 Revalidated Transportation Model (2191-TAZ) Spring, 2009 New Highway and Transit Networks early Fall, 2009 Preliminary Round 8 TAZ-level Forecasts Fall, 2009 Recalibrated Transportation Model (New TAZs) late Fall, 2009 Draft Round 8 Forecasts early 2010 Major CLRP Update Spring 2010 New Status Report by Jurisdiction COG Member jurisdictions NameStatusRemarks District of Columbia Preliminary meeting held Working within DC's schedule for addressing TAZ updates Montgomery County, MD (including Gaithersburg, Rockville, Takoma Park) County staff performing internal updates Will acquire new updates from county Prince Georges County, MD (including Bladensburg, Bowie, College Park, Greenbelt) Proposed COG/TPB changes sent Currently under review by county Arlington County, VA Proposed COG/TPB changes sent Pending final approval from county City of Alexandria, VA Meeting dates to be scheduledNext up on schedule Fairfax County, VA (including Falls Church and City of Fairfax) Meeting dates to be scheduledNext up on schedule Loudoun County, VA Preliminary meeting heldNext meeting date TBD Prince William County, VA (including Manassas and Manassas Park) Proposed changes sent; pending final approval from county Currently under review by county Frederick County, MD (including City of Frederick)Meeting date TBD BMC jurisdictions Howard County, MD Proposed COG/TPB changes sent Awaiting response from BMC Anne Arundel County, MD Proposed COG/TPB changes sent Awaiting response from BMC Carroll County, MD Proposed COG/TPB changes sent Awaiting response from BMC Status report by jurisdiction, continued Tri County Council for Southern MD (TCC) jurisdictions: NameStatusRemarks Charles County, MD Proposed COG/TPB changes sent; reviewing comments from county Pending final approval from county Calvert County, MD Proposed COG/TPB changes sent Pending final approval from county St. Mary's County, MD Zones completed & approved by county Awaiting additional data for comparison FAMPO jurisdictions King George County, VA COG staff to coordinate with GWRC City of Fredericksburg, VA COG staff to coordinate with GWRC Stafford County, VA COG staff to coordinate with GWRC Spotsylvania County, VA COG staff to coordinate with GWRC Additional COG/TPB Modeled Region Jurisdictions Fauquier County, VAMeeting date TBD Clarke County, VAMeeting date TBD Jefferson County, VA Proposed COG/TPB changes sent Awaiting proposed changed from county