This is the screen you see when you first run the program. It is the starting point for each session. Each large green square is a button; you just click on the button you want to execute the command.
A typical study would use data collected with the GPS2LT software, so we would click on that button.
The data collection is a little different for PC-LOS since you are only interested in one intersection at a time. In the field you drive through the intersection as many times as possible during the peak traffic times, choosing the approaches that likely have the most delay (you usually know this in advance). Each pass through the intersection is one run.