LTI TRUCAM LASER MEASUREMENT DEVICE - Tele-Traffic

Roadside Offset
The Roadside Offset is equal to the distance from the location where you
are taking the DBC measurement to the mid-point or centre of the road
where the vehicle is travelling.
The offset is used to eliminate any bias in the DBC calculation due to the
cosine effect (page 31).
As Figure 52 shows, when DBC is enabled the System Setup Screen
includes a Road Offset value located in the bottom right corner.
When entering the Roadside Offset, keep in mind that the minimum
capture distance is a 2.5-to-1 ratio.
• Example: If your Roadside Offset is 10 metres, the minimum capture distance to either target vehicle
would be 10 metres x 2.5 = 25 metres.
Use the TruCAM to measure the Roadside Offset Distance or manually enter the Roadside Offset Distance.
• The default value is 5.0 metres.
• Manual entry: valid range limit between 1.0 and 100.0 metres.
• Previous Laser entry range limits for minimum range recording are ignored.
Changes to the System Setup Screen are not saved until you tap or press the soft key.
However, unsaved changes are valid until the TruCAM is powered OFF.
Entering the Roadside Offset:
Use the stylus or the soft keys to select the Roadside Offset. Figure 53 shows the message box that will
be displayed.
Using the Laser to Measure the Roadside Offset Distance:
1. Select the “Laser Measure” option:
Use the stylus to tap the [1] field in the message box, tap the button, or press the soft key.
The screen should similar to Figure 54 (left).
2. Aim to the centre of the lane of travel and press the trigger. The measured distance will be displayed
at the bottom of the screen as Figure 54 (right) shows.
3. Tap the
or press the soft key to save this value or repeat step #2 if you want to change the
measured value.
Figure 53 Figure 54
40
Figure 52
© Tele-Traffic UK Ltd 2011