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TDC Ultra User’s Manual

11-2

Roundabout Movement Studies

Modern Roundabouts are one of the more popular new developments in

trafﬁc engineering and are being installed at an ever increasing number of

locations. However, while the physical design of a modern roundabout is

different from that of a standard intersection, the resulting vehicle move-

ments are very similar - in most cases either straight, left or right. As such,

the data collection for a Roundabout Movement study is very similar to a

Standard Turning Movement Study.

Note: To properly record roundabout movements with a TDC Ultra, you

must be able to see not only which approach the vehicle enters from, but

also track which approach it exits to. At busy intersections, more than one

person may be needed for the data collection.

The TDC Ultra is designed to make roundabout movement data collection

simple and accurate. The buttons are arranged to simulate the standard

approaches to an intersection, which makes collecting the data intuitive.

There are 16 buttons, which are normally used for the left, through, right

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Ultra Start 15xx Bedienungsanleitung Seite 90