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TDC Ultra User’s Manual

7-2

Gap Studies

The TDC Ultra makes it very simple to do manual gap studies. Most of trafﬁc

engineering is involved, one way or another, with managing gaps in trafﬁc.

After all, the primary purpose of a signal at an intersection is to artiﬁcially

create gaps so that trafﬁc can smoothly ﬂow through an intersection.

A gap is normally deﬁned as the amount of time, in seconds, between the

end of one vehicle and the beginning of the next. You can measure gaps on

an entire road, with several lanes of trafﬁc, going in different directions,

or you can measure gaps on individual lanes. It depends upon the data that

is required.

The TDC Ultra measures gaps by counting the time that a key (the GAP

key) is pressed and held down. This time is then sorted into one of 15 dif-

ferent bins, from 2 seconds up to 30+ seconds, in two second increments.

The total in that bin is then increased by one. After each interval period

(usually 5 or 15 minutes), the totals in all of the bins are stored in memory,

and then reset to zero. Data is then collected for another interval.

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Ultra Start 15xx Bedienungsanleitung Seite 64