Two buttons are all that are used to move from menu to menu, and to select from the options shown on the display. The TAB key is used to cycle through the options while the DO key is used to select an option. If you move the highlight too far and over-shoot the desired option, just keep pressing the TAB key until it is re-selected.

The DB-400 is designed to make collecting turning movement data easy and accurate. The buttons are arranged to simulate a standard intersection. There are 16 buttons, with 12 normally used for the left, through, and right movements from each of the four approach directions. The additional four buttons are user-defined; they can be used for bicycles, pedestrians, or whatever you want.

Since the DB-400 looks like an intersection, doing a count is very intuitive. If a car makes a left turn from an approach, you simply push the button that shows a left turn from that direction. The DB-400 keeps track of everything else for you. At the end of every time interval, the data is automatically stored, so there is no need for technicians to take their eyes off the intersection to write down numbers.

While you record turning movements, you also have the option to classify the vehicles recorded in up to three separate classes using the DB-400's 'Bank' buttons. Trucks and other heavy vehicles can be stored separate from passenger vehicles, and percentage breakdowns can be determined.

Multiple studies can be stored in the DB-400, using up to a total of 312 intervals of data. For each count, the unit stores the date and time, the number of intervals used, a site code, and the data.

At any convenient time, you can transfer the data to your computer through the serial port to our PETRAPro software. The PETRAPro software allows you to easily read, edit and store the data, as well as print a variety of reports and graphs, without ever having to manually enter data.