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TDC Ultra User’s Manual

11-6

Roundabout

Count: 001 Int: 001

08:01:23 Rem 13:37

The TDC Ultra is waiting for you to push any movement button, which

starts the study. The display in the lower left corner shows the current

time, so it is easy to synchronize the start of the count to the beginning

of the desired interval. You do not have to push the ﬁrst button exactly

when the seconds roll over to zero. The analysis software rounds the

start of the study to the nearest minute automatically. However, when

starting a new study, always try to begin as close to an interval bound-

ary as possible, such as xx:00, xx:15, xx:30, or xx:45.

Press any of the gray keys to begin counting and the TDC Ultra will

start recording data.

When you push the ﬁrst button

to start the study, the display

changes to show the amount of

time left in the present interval.

In this case, it starts at 15:00

minutes and counts down to

zero. At the end of each interval, the TDC Ultra beeps three times.

Normally you are not watching the display, you are watching the trafﬁc.

The beeps remind you that the interval is over. This is only important if

this is the last interval and you are ready to quit; otherwise, just ignore

the beeps and keep counting vehicles.

The actual recording of the data is very simple. Watch a vehicle as it

approaches and track it as it moves through the roundabout. If it makes

a right movement, press the right movement key for the approach it

came from, as shown below.

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Ultra Start 15xx Bedienungsanleitung Seite 94