TRIPCAL5 program documentation manual

In an effort to update the transportation planning process employed by the Texas Department of Transportation, a new trip generation program, TRIPCAL5, was developed in 1990. TRIPCAL5 is a multi-functional, flexible program for estimating trip productions and attractions for multiple trip purposes via user-specified models. Trip productions and attractions may be estimated for up to 10 trip purposes and 9,999 zones. The program includes such features as user- specified trip production and attraction models, input of user-developed disaggregate data at the zone level, and/or the disaggregation of the zonal data using default models within the program. The program's flexibility allows the trip generation process to be designed to maximize the use of local data and provides a quantum improvement in the trip generation process. This manual is designed to provide technical documentation for the trip generation program TRIPCAL5. It is supplementary and complementary to two prior reports which detail program specifications and instructions for the setup and operation of TRIPCAL5. Included in this report are program options; a brief discussion of the function and purpose of each subroutine; crossreference of the subroutines and functions; description of each of the variables by labeled common statements; description of the sorts and sort keys; data set formats; how the data flow through the program; discussion of the results of the program tests which were done; and a summary. The documentation of the default models contained in the program will be published as a supplemental technical appendix to this report.