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6-3

Note that the data collection for this study is for one approach only. Also

note that the data collection requires you to record the number of vehicles

in the queue for an approach. If your trafﬁc volumes are so high that you

cannot count the vehicles in the queue, or see the end of the queue, this

study should not be used.

Doing a Signalized Intersection Delay study is actually like doing two

studies at once.

First, you are recording every vehicle that comes to the intersection from

a speciﬁc approach as either having Stopped (the light is red or the light is

green but a queue exists) or gone Through (the light is green and no queue

exists). You only record a vehicle once - it is either Stopped or Through.

Second, while you are recording the approach vehicles the TDC Ultra will

beep at a designated interval you have selected (between 10 and 16 seconds).

When the beep occurs, you enter the number of vehicles in the queue at

that exact moment.

These two procedures, taken together, provide enough information to give

measurements of the delay at that approach.

Signalized Intersection Delay Studies are not as intuitively obvious as most

of the other studies performed with the TDC Ultra. It may seem at ﬁrst

glance that there isn’t enough information to generate any realistic data.

Rest assured, however. This procedure is well known in Trafﬁc Engineering

circles, and has been veriﬁed many times by researchers in the ﬁeld.

Chapter 6 — Signalized Intersection Delay Studies

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Ultra Start 15xx Bedienungsanleitung Seite 59