FSUTMS Comprehensive Modeling Workshop - Cambridge ...

Special Generator Method (Cont’d)
►Method
Calculate ITE external trip generation off-model.
Input trips into the special generator file for the
zone(s) ) corresponding to the development site.
Allocate trip percentages into the trip purpose
categories in the special generator file.
Factor ITE vehicle trips to person trips
Run the model.
Compare ITE trips to the loaded network link
volumes corresponding to the links at the site
cordon.
FSUTMS--CUBE MODELING TRAINING SERIES
25
Special Generator Method (Cont’d)
► Method (Cont’d)
Adjust the trips in the special generator file as necessary
and rerun the model:
Increase the number of trips if the model trip volumes at the site
cordon are lower than the ITE trips.
Decrease the number of trips if the model trip volumes at the site
cordon are higher than the ITE trips.
This may be an iterative process.
Once the model volumes are greater than or equal to
the ITE trips, conduct a selected zone analysis of the
zone(s) ) corresponding to the development site in order to
trace trips throughout the network.
Take Take the results from the model and continue with the
analysis using established practices.
FSUTMS--CUBE MODELING TRAINING SERIES
26
12-13