Ultra Start 15xx Manual de usuario Pagina 80

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TDC Ultra User’s Manual
9-4
How to do a Stop Sign Delay Study
When you are ready to begin a Stop Sign Delay study, select Count from
the Main Menu, then select New and then select SD.
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.
Start Study
After you have selected a Site
Code, you are ready to start
the study. The display shows
the count number and type of
study. It also shows the current
time so that you can start the study at a specific time.
The TDC Ultra is now waiting for you to press one of the Stop keys
(1S or 2S) to start the count. Ideally, you should wait until there are no
vehicles in the queue in either
of the lanes of interest. If that
isn't possible, then you can
start with any vehicle. Once a
Stop key is pressed, the screen
shown here is displayed.
Each time you press one of the Stop keys (1S or 2S), the display for that
lane will increment by one. You want to press the Stop keys quickly to
get the display to show the number of vehicles that are actually in the
queue at the start of the study. If there are no vehicles in a lane when
you start then you don't have to add any.
As each vehicle pulls up to the back of a queue and stops, press the
corresponding key (1S or 2S) on the TDC Ultra. You need to determine
when a car has "effectively" stopped. Many cars like to creep up on a
stop sign. You have to use your judgement in cases like these. As long
as you are consistent, the analysis results will be correct.
As any vehicle in a lane crosses the stop bar, press the corresponding
lane Go key (1G or 2G). The display on the TDC Ultra for that lane
will decrease by one to show that the queue has decreased.
Stop Sign Delay
Count: 001
10:56:13
Stop Sign Delay
Lane 1 Queue:001
Lane 2 Queue:000
10:57:01
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