Making Household Microsimulation of Travel and Activities Accessible to Planners
نویسنده
چکیده
There is a large gap between the aggregate, trip-based models used by transportation planning agencies and the activity-based, microsimulation methods being espoused by those at the forefront of research. The modeling environment presented here aims to bridge this gap by providing a palatable way for planning agencies to move towards advanced methods. Three components to bridging the gap are emphasized, including an incremental approach, demonstration of clear gains, and providing an environment that eases initial implementation and allows for expansion. The modeling environment (called STEP2) is a household microsimulator developed in TransCAD, which can be used to implement a 4-step model as well as models with longer term behavior and trip chaining. An implementation for Southern Nevada is described and comparisons are made with the region’s aggregate 4-step model. The models perform similarly on numerous counts. A key advantage to the microsimulator is that it provides impacts by socio-economic group (essential for equity analysis) and individual trip movements (for use in a vehicle microsimulator). A sensitivity analysis indicates that the microsimulation model has less inelastic cross elasticity of transit demand with respect to auto travel times than the aggregate model (aggregation error). The trade-off is that microsimulators have simulation error; results are presented regarding the severity of this error. This work shows that shifting to microsimulation does not necessarily require substantial investment to achieve many of the benefits. One of the greatest advantages is a flexible environment that can expand to include additional sensitivity to demographics and transportation policy variables.
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