Ultra Start 15xx Bedienungsanleitung PDF herunterladen (Seite 72)

TDC Ultra User’s Manual

8-4

Saturation Flow Rate Template

Page 7-2 shows the template that is used for Saturation Flow Rate studies. It

is color coded to make the study easier to perform. The Signal Phase keys at

the bottom of the template show the proper colors. The keys labeled 1C-4C

are primarily used during the green phase of the signal, therefore they are

surrounded by a green border. The keys labeled 1S-4S are used only during

the red phase, so they are surrounded by a red border.

The keys labeled 1C-4C represent individual lanes on the approach to

the intersection under investigation. In theory you can monitor up to four

lanes at once. In practice it is rarely necessary to do more than two lanes.

You are primarily interested in the worst case situation, and that is usually

limited to one or two lanes. You need to assign a given key to a given lane.

You can use any of the four keys for any of the lanes, however it is easier

to remember which key corresponds to which lane if you choose keys that

match the lane conﬁguration on the street.

If you are measuring the two through lanes, then use 2C and 3C. If you

are measuring the left turn lane, then use 1C. Select keys that match the

geometry.

Each of the keys 1C-4C has a corresponding key labeled 1S-4S. They have

the same color and arrangement. It is important that you use the proper pair

of keys while you do the study; if you use 2C then you must also use 2S.

At the top of the template is a very important key, the OOPS! key. This key

deletes the last keys that were pressed. If you hit the wrong key (especially

one of the phase keys), then you can quickly press the OOPS! key and

then the correct key. If you hit several wrong keys in a row then you can

repeatedly press the OOPS! key to try to get back in sync. Each press of

the OOPS! key removes one key.

The OOPS! key is especially valuable if you hit a phase key by mistake.

The analysis of the data for that cycle will be wrong if the phase timing is

wrong. An error in the 1C-4C or 1S-4S keys is not as damaging, although

errors should be corrected as quickly as possible.

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Ultra Start 15xx Bedienungsanleitung Seite 72