
TDC Ultra User’s Manual
5-4
any type of event. It doesn’t have to be vehicles, or even traffic related
for that matter. As long as you can define a unique button to a particular
“class”, and an observer can distinguish one class from another, then you
can do a manual study with the TDC Ultra. Applications are limited only
by the imagination.
One of the templates that is included with the TDC Ultra is designed for
Classification counts. One side has the FHWA Scheme F pre-assigned to
buttons one through thirteen, as shown on page 4-2. The other side has a
special frosted surface to allow you to write your own scheme using a pencil
or water-based marking pen. There is a rectangle next to each button so
you can write some sort of easily recognized symbol or code designation
that you develop. The center section allows you to write more complete
descriptions of the classes.
The first step to do a classification study is to decide if you are going to use
the FHWA Scheme F, or one of your own. For your own scheme, you need
to carefully design the classes and assign a key to each class. Try to group the
classes logically, with related classes next to one another if possible. Next,
design the template symbols and descriptions and write them on Template
1B. A pencil, or a water-based marking pen work well. Once this is done,
you are ready to bring the TDC Ultra out to the site and do the study.
How to do a Classification Study
When you are ready to begin a Classification study, select Count from the
Main Menu, then select New and then select CL.
You are then prompted to select a site code type and assign a site code.
Refer to page 2-5 for information on selecting a site code.
Choose Classification Scheme
Once you have entered your site code you will be prompted to select
the classification scheme to use with your study.
SCHEME-F USER-DEF
EXIT
Scheme-F Federal
Standard, 13 keys
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