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TDC Ultra User’s Manual

9-2

Stop Sign Delay Studies

The Stop Sign Delay study in the TDC Ultra is designed to allow you to

measure the trafﬁc characteristics at an intersection controlled by a stop

sign. Although it primarily measures delay, it also provides information

about the queue length and trafﬁc volumes at an approach.

This study should not be confused with the Signalized Intersection Delay

study in the TDC Ultra (Chapter 5) which is primarily used at high volume

signalized intersections. That study uses a statistical average to calculate

delay. This study measures the actual delay of each vehicle as it progresses

through a stop controlled intersection. Note that this study can also be used

for signalized intersections that have low volumes.

The procedure implemented in the TDC Ultra is based on accurately mea-

suring the time that events happen. This contrasts with most of the other

studies in the TDC Ultra which are based on counting the number of events

that happen in a relatively long time period. The events are timed to a res-

olution of 15.6 milliseconds. To perform this study correctly you have to

press the proper keys at exactly the right times.

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Ultra Start 15xx Bedienungsanleitung Seite 78