The app interface is easy to use and intuitive as it resembles an actual intersection with arrows. For example if a vehicle approches the intesection and makes a right turn, you simply tap the button that indicates the left turn, in addition if the user wants to classify the vehicle, all he/she needs to do is to tap to the class type from 13 different Classes (FHWA scheme F) and it will assign to that vehicle.
The Traffic App keeps track of each timestamp entry, location, direction, etc. Once the study is done, simply download and perform the studies for any location. There is no limit on study locations that the unit stores.
Screenshot Example from a Cell Phone