Computer Aided Transportation Software was developed to improve data collection methods involving a Distance Measuring Instrument (DMI). Prior to C.A.T.S., this information was recorded with a stopwatch and a notepad, and later with a DMI unit and a notepad. The versatile Windows program can be used for anything from travel time runs and congestion management, to producing speed profiles for roads and synchronizing traffic signals. C.A.T.S. collects 20-30 times the data as the stopwatch method. There are two modules in C.A.T.S.: the DOS-based DMI-Read module records data from the probe vehicle and DMI unit and the Windows based Setup and Analysis module.