2 Tysons Purpose of CTIAs Analyze impact of pipeline developments. Individual impact studies (TIAs) do not consider pipeline developmentsAnalyze 2030 and 2050 levels of development for the analysis area and determine associated mitigation measuresFinalize grid of streets includingFunctional classificationNumber of lanes between and at intersectionsAccommodation of transit, bikes, and pedestriansRight-of-way needsCreate a Tysons-wide simulation modelBullet 1 – the necessary adjustments would provide an acceptable level of traffic flow, be cost effective, and identify the minimum ROW required with the least negative impacts to adjacent properties and the environment by taking into consideration the provisions of the Tysons comprehensive planBullet 2 – Three levels of development are being tested – 1. Plan Buildout including Rezonings, 2. Rezonings with existing development, and 2030 GMU Forecast
3 Tysons East is used as an example Macroscopic Models – Regional Transportation ModelPublic policy, regionally significance projectsMesoscopic Models – Sub Area ExtractionsLink regional trip purpose to details of micro-simulation modelsMicroscopic Models – Street Traffic analysis“Visualization” of solutions, detailed intersection operations analysisTysons East is used as an example
4 MWCOG Regional ModelThis is an overview of the entire MWCOG model. The entire model is heavily concentrated in the Metro Washington area which includes a great level of detail in Fairfax County. The red polygon shoes the full extent of the VISUM model while the smaller red polygon represents the Tysons East study area.
5 Tysons East Analysis Area -This image is of the Tysons East CTIA Analysis Area.-The CTIA analysis area is defined as a coherent area of Tysons where rezoning activity is prevalent and where the traffic impact of the rezoning activity is significant. It is also typically a sub-district as defined in the Tysons Comprehensive Plan with adjustments resulting from taking into consideration traffic impact and the grid of streets. Gateways providing access and egress to and from the analysis area will be included in the analysis.
6 Tysons Central Analysis Area -Like the last image, this is the Tysons Central Analysis Area
7 Tysons West Analysis Area -Finally, this is the Tysons West Analysis Area
8 Volume/Capacity Sample Output -This map shows a sample result, output by the model of a Volume-to-capacity ratio map.(Explain how these are used and how we are coordinating this data with the developers and their consultants for review.)
9 Measures of Effectiveness (MOE) Level of Service and Delay at IntersectionsVehicles Mile TravelHours of DelayAverage SpeedTravel TimeQueue Length
10 CTIA Process with Stakeholders Weekly meetingsInclusive, collaborative processFull access to informationAnalyze suggestions from stakeholdersMany iterations of testing alternative mitigation measures – what transportation measures are required to accommodate proposed land use intensity levels?Focus is cost-effectiveness
11 CTIA Analysis Process – Tiered Approach No right of way impact (traffic reassignment, signal modification, lane restriping)Some right of way impact (turn lanes, additional through lane, additional grid link)Additional mitigation-Mention use of CDPs-describe large scale mitigations.-used in conjunction with lesser mitigations (ex: lane config changes depending on what large scale mitigation used)
16 Conclusions (Tysons East) Traffic impacts were mitigatedIdentified right-of-way needsFinalized grid of streetsNext StepsSubmit analysis to VDOT to meet VA traffic impact study requirementsPlan amendment
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