9-line access access management access point accessibility ADA air quality alignment amenity antiplanner atlanta BART benchmark BID bike Blogs boston branded bus corridors brookings brt bus Bus Rapid Transit BYU capacity car pool car pool lane cars central link Centrality certification commuter rail condo congestion congestion pricing connections consistency coverage crossings CRT cycling DART dedicated dedicated right of way density denver depreciation developers development economics efficiency Envision Utah equity eugene exclusive extension FAQ favela Federal Funding Flex Bus florida free fare zone freeways frequent network frontrunner frontunner Gallivan garden cities gas prices geotagging goat Google grade-separation Granary District growth headway heavy rail hedonic High Speed Rail history housing housing affordability housing bubble housing prices HOV income infill innovative intersections intensity ITS junk science LA land use Land Value Economics LEED legacy city light rail linear park location LRT lyft M/ART malls mapping maps metrics metro MetroRail missoula mixed mixed traffic mixed-traffic mobile mode choice Mode Share multi-family MXD neighborhood networks news NIMBY office online op-ed open letter Operations parking parking meters peak travel pedestrian environment phasing Photomorphing planning Portland property property values Provo proximity quality_transit rail railvolution rant rapid rapid transit RDA real estate redevelopment reliability research retail Ridership ridesharing right of way roadway network ROW salt lake city san diego schedule schedule span seattle separated service branding shuttle silver line single family SLC SLC transit master plan slums smartphone snow sprawl standing stop spacing streetcar streetscape streetscaping subdivision Sugarhouse Sugarhouse Streetcar Tacoma taxi technology tenure termini time-separation TOD townhouse traffic signal tram transit transit agency transit networks transit oriented development Transit Planning transponder transportation travel time TRAX trip planning trolley tunnel uber university of utah urban design urban land UTA UTA 2 Go Trip Planner utah Utah County Utah Transit Authority value vmt walking distance web welfare transit Westside Connector WFRC wheelchairs zoning

Tuesday, September 13, 2011

Dynamic Travel Assignment

WFRC is building a new traffic model. I'm attending the update meeting, and taking notes. Thought I might as well publish them. I believe they are using Dynus-T.

Ability to model how people shift their routes or departure times in response to congestion, pricing, controls, incidents, and improvements. Also, understand how individual impacts affect entire region. Not as detailed as micro models, but capable of high-fidelity simulation of entire region. Not micro-simulation of individual cars.

Macro-Meso-Micro integration.
Travel Demand Model-->VISUM-->VISSIM
 Automatically integrating data from the higher tier into the lower level of modeling as part of the model flow.

NEXTA.exe. Fort Worth Network in Dallas, 13 zones. Each link with data loaded.
Dynamic traffic assignment--can see traffic density over time.

--Transit network built on highway network. Cube model uses that info to extract data about how long transit trips will take, and how many people will take transit on that basis. But the percent of people who have walk-access to the transit station is a big question--what portion of pop/emp in a TAZ can do this?

WALKPCT identifies the percent of a zone that can actually walk to transit.

Local Bus--buffer around a line
TRAX/BRT--Buffer around stops.