Ultra Start 15xx Bedienungsanleitung PDF herunterladen (Seite 81)

9-5

Chapter 9 — Stop Sign Delay Studies

********IMPORTANT********

The Lane Queues shown on the TDC Ultra should always match the

actual queue lengths on the street. If they do not, a mistake has been

made and there may be problems with the data analysis.

Use the OOPS! key if you hit the wrong key by mistake. Do not try to

ﬁx the data by pressing the Stop (1S or 2S) or Go (1G or 2G) to make

the queue lengths on the display match the actual ﬁeld conditions. This

procedure would add or subtract vehicles from the data, and distort the

analysis results. Always ﬁx bad entries with the OOPS! key.

This is a fairly simple study to do. There is one way, however, the data

can be distorted. If a car changes lanes after you have marked it as

stopped, (which doesn't happen very often) then you must be careful to

pretend that the car is still in the original lane, and press the original lane

key when the car ﬁnally enters the intersection. The lane queue values

on the display will be off until this rogue car clears the intersection,

but this can't be helped.

Rolling Stops

Occasionally, when no queue is present, you may encounter a vehicle

that does not completely stop at the intersection, but ‘rolls’ through it.

The method we recommend for recording these vehicles is to press the

Stop key then immediately after press the Go key. This will result in

the vehicle being recorded with a delay of zero or one seconds, which

will keep your volumes accurate. These vehicles can then be ﬁltered

out using the analysis software.

Ending the Study

When you are done collecting data, turn the TDC Ultra off.

Remember, the only way to stop a study is to turn the power off.

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 123 124

Keine Kommentare

Ultra Start 15xx Bedienungsanleitung Seite 81