Ultra Start 15xx Bedienungsanleitung PDF herunterladen (Seite 79)

9-3

This is a simple study to understand. You press one key when a vehicle

stops at the end of the queue, and you press another key when a vehicle (not

necessarily the same one) crosses the stop bar. The TDC Ultra accurately

measures the times when you press each key. The analysis software then

can calculate how long it takes each vehicle to progress through the queue

and enter the intersection. The software also calculates the number of cars

in the queue at all times.

Stop Sign Delay studies are normally done at one approach to an intersection.

Typically, you would study the approach with the highest volume, since

that approach would likely have the longest delays. You can measure one

or two lanes at once.

You want to position yourself so that you can see vehicles as they stop at

the back of the queue, and also as they enter the intersection. The diagram

below shows the position we recommend for doing the data collection,

although you can position yourself anywhere you feel we let you easily

observe the vehicles you are recording.

When you are in a good position, you are ready to start the study.

Chapter 9 — Stop Sign Delay Studies

STOP

Stand Here

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Ultra Start 15xx Bedienungsanleitung Seite 79