JAMAR Technologies TRAX I, User Manual

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TRAX I User’s Manual
4-2
Road Tube Layouts for the TRAX I
The TRAX I is equipped with twelve pre-programmed tube layouts for
recording traffic data. These are designated as L1 through L12 and repre-
sent the most common types of layouts used to record traffic data.
The following are descriptions of each of the layouts, and the type of data
that can be collected with each. Each layout is different, but there are some
common principles that should be used with any layout that is chosen.
• The condition of the road tubes, the manner in which they are in-
stalled and the length of the tubes are all critical to achieving good
results. Refer to Chapter 3 Road Tube Installation for more informa-
tion on this.
• A tube length of sixty (60) feet is recommended for round tube, and a
tube length of fifty (50) feet is recommended for mini tube.
• In all tube setups of more than one tube, the tube length from the end
of the road to the counter must be the same for all tubes.
• In all short tube, long tube layouts, the vehicle must strike the short
tube first.
• To collect class or speed data, a minimum of eight feet of tube spac-
ing is required to achieve accurate results.
• For counts done in the volume only mode, the TRAX I will either do
a straight axle count or use the divide-by-two technique, in which ev-
ery two axle hits will increment the TRAX I by one. In order to record
volumes on a vehicle by vehicle basis without regard to their number
of axles, you must be in the Binned mode with the appropriate hose
configuration.
• Data can be collected in the Basic mode with any of the tube layouts,
since basic data is essentially a collection of all the sensor activations
on an individual basis. However, the minimum tube spacing require-
ments still apply to Basic data. If a layout says volume only, that is the
only information you will be able to accurately get from it. You can
collect data in the Basic mode with an L1 layout, but you will only be