Turning Movement Counters

The TDC-ULTRA w/ Video Mode is a versatile traffic data collection tool and turning movement counter.  Not only does it do the most common of all manual traffic data studies - turning movements - it does an additional nine studies.  The TDC-ULTRA has a USB Port for downloading, the ability to collect Roundabout Movement Data and the ability to record data in Video Mode.


The TDC-ULTRA is easy to use, accurate and reliable. It is the easiest way to collect intersection data for quick analysis, saving you time and money.


Includes:  TDC-ULTRA, carrying case, overlays, automobile power supply and manual.

*PETRAPro Software NOT included.

Video Mode

A popular way to do turning movements and other traffic studies is to video record the location and later count the traffic while watching the video playback.  The new Video Mode selection of the TDC-Ultra is designed to let you do this in an efficient manner.

With Video Mode you can now do a count by running the video faster (or slower) than real time. You can also take breaks during your counting without disrupting how the data is stored.

With the Video Mode you can complete a study in a fraction of the time it would take to do it in real time.  In addition to standard turning movement studies, the Video Mode of the TDC-Ultra also supports Roundabout, Vehicle Classification and Multi-direction Gap studies.

All studies can be processed with JAMAR’s PETRAPro software.

Turning Movements

As a reliable turning movement counter, the TDC-Ultra 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 TDC-Ultra 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 TDC-Ultra 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 TDC-Ultra's 'Bank' buttons. Trucks and other heavy vehicles can be stored separate from passenger vehicles, and percentage breakdowns can be determined. 

In addition to the standard 3-class turning movement studies done by the TDC-Ultra, you can also do enhanced turning movement studies for up to 14 classes of vehicles. Vehicles can be classified based on the Federal Highway Administration’s standards, or by a user defined scheme of up to 14 classes. This is accomplished by the addition of 14 class buttons at the bottom of the data collector. You also are given several options on how to record the data with these keys.

Multiple studies can be stored in the TDC-Ultra turning movement counter. For each study, 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 USB port to our PETRAPro Software, which allows you to easily read, edit and store the data, as well as print reports, without ever having to manually enter data.

Easy Editing and Data Processing

Approach Wizard & Intersection Design

Access Aerial Views & Include Digital Photos

Roundabout Turning Movements

Stop Sign Delay

Signalized Intersection Delay

Multi-direction Gap

Spot Speed with Classification

Vehicle Classification




Flow Rate

Time-Stamped Raw Data

Is there a specific type of data collection that you would like to do that the data collectors don’t? Don’t let this stop you from getting your data, just use the TDC-Ultra’s time-stamping capability. In this mode, whenever a key is pressed the unit stores the key number and the exact time it was pressed. Each key press is stored with a time stamp accurate to one-hundredth (.01) of a second. This raw data can be downloaded and exported into Excel or other programs for custom analysis. Now you can do literally any type of data collection using a TDC Ultra and your own program.


Size:  8.5” x 6” x 1.5”

Weight:  Approximately 1.5 lbs.

Memory:  128K, CMOS RAM. Lithium battery backup

Display: Wide temperature, 20-character LCD display

Output:  ASCII format capable of being read by JAMAR software or other communications program

Clock:  Always active real-time clock

Interface:  USB B Port

Power: 4 AA alkaline batteries or 6-18 volts, DC, 200 ma through external jack


Our sales/support staff has decades of experience in all aspects of traffic data collection.

Call for Support: 800-776-0940