The DB-400 is an electronic handheld device that enables the agency to do intersection-turning movement counts. The DB-400 records turning movement data for up to three classes of vehicles, downloads to PETRAPro software, and is accurate, reliable and easy to use. The software program allows the agency to easily read, edit and store the data as well as print a variety of reports and graphs without having to enter the data manually.
The DB-400 is simple to use. An OFF/ON switch on top of the unit is used to turn it on and off. A four-line by 20-character display helps you select the proper entries. All options are clearly displayed, with the currently selected option shown with a blinking highlight. The bottom lines of the display explain the option that is highlighted.
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.