b'How Strategic Models Can Help Practitioners Plan for ChangeSKETCH PLANNING TOOLS and output visualization. Strategic models are useful Sketch planning tools have been around since thefor exploratory testing. These tests can include early 1990s, coinciding with the rise of geographicevaluating diverse policy and investment alternatives information system (GIS) capabilities. Several sketchat regional or statewide scales. However, since they do planning tools operate as extensions to GIS (e.g.,not include network models, they are less appropriate CommunityViz), while others use Microsoft Excelfor evaluating specific projects or corridors, like spreadsheet models (e.g., Envision Tomorrow anddetermining if a highway segment should be widened Mixed-Use Trip Generation ModelMXD), indepen- or made into a tollway.dent software (e.g., UrbanFootprint), or online (e.g.,Structurally, strategic models are disaggregate SPARC/INDEX) platforms. These tools support variousdemand/aggregate supply models. They combine geographic scales, including work at the site, corridor,the rich demographic and socioeconomic detail of municipal, regional, or statewide level. The abundancesimulated households with aggregate treatments of of sketch planning tools is due to their relativelytravel (multimodal travel and congestion without using low cost to develop and minimal data requirements.a network or explicit trips). Strategic models simulate Sketch planning tools excel at producing quick, rougha synthetic household populationa characteristic estimates for a limited range of land-use and policyshared with activity-based travel demand models. scenarios. To create scenarios, most sketch planningBy creating a synthetic set of individual households, tools require users to define land-use alternativeseach associated with a household income and vehicle using GIS visuals that are then linked to spreadsheetownership, among other characteristics, strategic analyses. The travel demand estimates of sketch plan- models can examine equity effects and the impacts of ning tools are simplistic and are often tied directly tofuel prices, pricing policies, service prices, and other land-use types (as opposed to being network based).factors on mode choice and travel behavior.One advantage of sketch planning tools is they includeStrategic models are like integrated models in diverse sustainability impacts in their analyses. Often,that they can account for the interplay between sketch planning tools have modules on health, agricul-tural impact, and natural resource management. Thiscontinued on page 5emphasis makes sense since these tools are focusedFIGURE 1.STRATEGIC MODEL NICHEon a wide range of performance measures/outcomes for a typically less-technical audience. That said, the exact scenario-development capabilities vary widely depending on the tool. In addition, since several sketch planning tools are integrated with mapping platforms, they areby designvisually robust and can produce high-quality mapped outputs.STRATEGIC MODELSStrategic models occupy a middle ground between sketch planning tools and complex integrated models (Figure 1). They have been implemented in a few different platforms, including in R, an open source data science programming language. Some also have a graphical user interface (GUI) for user interaction Source: Oregon DOT, 2019 (adapted by RSG) 2020 RSG 3'