The official travel model used at PSRC is known as 4K. Originally released in late 2013, 4K is an advanced “four-step” travel model and we use it to analyze the performance of myriad future scenarios of transportation infrastructure.
It’s a bit of a beast, though: the model can take about 24 hours to run a single scenario, and until today, each run would fill about 190 GB (gigabytes) of disk space. That’s a lot.
With today’s release of 4K version 4.0.3, we’ve made some big improvements. This is a no new features release: we focused only on fixing bugs and improving the model’s disk footprint.
 In 2008, Apple introduced OS X Snow Leopard, an operating system with lots of bugfixes but no new features. Source: MacWorld |
Notable improvements:
- 50% Smaller! A typical run of 4.0.2 filled 190Gb, down to 90Gb in 4.0.3.
- Consolidated assignment results (road and transit volumes) into a single summary databank, for easier analysis
- Refined summary tables for mode choice results
You can find 4K and its documentation at our modeling home page.