TEAPAC Suite, PRETRANSYTdetails

PRETRANSYT
Pre- and Post-processor for TRANSYT Network Optimization

PRETRANSYT is the pre- and post-processor in TEAPAC Complete to be used with various versions of the TRANSYT program, particularly current versions of TRANSYT-7F. TRANSYT requires a rigid input stream of specially numbered card types and coded input fields. On the other hand, TEAPAC accepts data in a form directed by traffic engineering terms which are easy to understand, and builds the fixed format TRANSYT input, thus eliminating user error in coding card types and batch input. Sub-system analysis is also very easy with TEAPAC.

This interactive analysis tool will automatically generate the network structure required by TRANSYT for the signal system being analyzed, thus the user does not have to generate individual link numbers or specify all of the link-to-link movements throughout the network. Further, the phasing and timings for each signal are specified in straightforward traffic engineering terms, and can be changed easily when testing alternatives. After an analysis by TRANSYT is completed, TEAPAC has the capability of importing the TRANSYT results and interactively plotting a time-space diagram for any portion of the system, as well as easy-to-read signal timing charts with phasing diagrams. Because of the ease of input, an entire day's variation in traffic conditions can be analyzed quickly and accurately. This, in combination with the capacity analysis output TEAPAC, provides all the information needed to implement the optimum timings in a network. Furthermore, PRETRANSYT uses the saturation flows and average signal phasings and timings for each signal generated by TEAPAC's signal analysis optimization. Since these are required inputs of TRANSYT, the use of PRETRANSYT in conjunction with TEAPAC's signal analysis makes a smooth, error-free system for signal timing optimization. PRETRANSYT can also export to PASSER-II, NETSIM/CORSIM and others based on the same data base to take advantage of the benefits each program offers.

TRANSYT simulates the total delay and stops to vehicles traveling in the network, and seeks to set the signal timings to attain a minimum combination of delay and stops. The procedure provides a concise and well-founded operational design for a signal system. The program can be used to simulate existing signal system operations as well as to optimize operations. The analysis pays special attention to heavy turning movements within the system, as well as exclusive turning phases, a refinement which is poorly covered by traditional linear progression analysis. As such, the use of TRANSYT is highly recommended. PRETRANSYT allows quick and effective use of any version of TRANSYT.

this page last updated February 04, 2019