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FSUTMS Comprehensive Modeling Workshop - Cambridge ...

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Why are large zones a problem for access?<br />

► Increases aggregation error with virtually all model<br />

elements<br />

Land<br />

use: : large amount of activity in expansive zones<br />

Highway modeling: unrealistic (“overburdened(<br />

overburdened”)<br />

assignment<br />

Zonal Zonal access, Mode Choice<br />

Centroid connectors<br />

Incorrect or over-estimation estimation of accessibility<br />

Path-Builders/Assignment Methods<br />

Ability to access highway & transit networks<br />

► Loses forecasting accuracy<br />

<strong>FSUTMS</strong>--CUBE MODELING TRAINING SERIES<br />

13<br />

Highway Network Modifications<br />

► Three elements should be represented in a highway<br />

network for transit:<br />

Transit-only links<br />

Code links on a highway network<br />

Coded with Facility Type 69 with special fields<br />

Micro-coded coded stations<br />

Separate rail and bus platforms<br />

Individual links connect station nodes to network/bus stop nodes<br />

Station data<br />

Park-ride ride and fixed-guideway station information kept on nodes<br />

<strong>FSUTMS</strong>--CUBE MODELING TRAINING SERIES<br />

14<br />

7-7

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