
TDC Ultra User’s Manual
5-6
Select Number of Directions
If you have chosen to use the FHWA’s Scheme F, or selected a User
Defined scheme with 16 or less classes, you will see the screen shown
here.
This screen allows you to decide how many directions of data to col-
lected. If you select 2 or 3, while doing the study you use the BANK
keys in conjunction with the primary 16 keys to record data for a second
or third direction.
Interval
Once you have selected the number of directions to record you’ll be
prompted to select an interval length.
You are given the choice of 1, 5, 15, 30, or 60 minute intervals. An In-
terval is the amount of time the TDC Ultra collects data before it stores
the accumulated totals in memory. You are barely aware of intervals
changing when you do a study with the TDC Ultra (it beeps at the end
of each interval to let you know it may be time to go home). The TDC
Ultra automatically keeps track of the time and stores the data at the
end of the interval. You only have to concentrate on collecting the data.
This is one of the major features of the TDC Ultra.
The default value is 15 minutes, as this is the most common interval
length used for classification studies. We recommend that you use 15
minutes unless you have special requirements.
Press DO once you have selected the interval length you wish to use.
Number of directions
1 2 3 EXIT
Single direction, no
BANK keys active
1 5 15 30 60 EXIT
Select interval
duration (minutes).
Press DO to accept
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