JAMAR Technologies TRAX Totalizer, User Manual

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TRAX Totalizer User’s Manual
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What is the TRAX Totalizer?
The TRAX Totalizer is an automatic traffic counter designed and built by
JAMAR Technologies, Inc. It is designed for ease of use, but contains many
options and features that are needed for comprehensive traffic volume data
collection.
Depending on the type of unit purchased, the TRAX Totalizer can collect
data in two different formats — total volume along with 24-hour volumes
or total volume along with hourly volumes. The counter is designed to al-
low the collection of volume information without the need to download to a
computer. There are two models of the TRAX Totalizer — one that collects
data using road tubes, a second that collects data using loops.
Road Tube Data: Divide-by-Two Volumes
Totalizers that are equipped for road tube data collection use the divide-by-
two method when recording traffic volume. This means that the Totalizer
will increment one for every two axle hits. It will record a two-axle car as
one (1) count while a four-axle truck will be recorded as two (2) counts.
For a vehicle with an odd number of axles, the Totalizer will record each
pair of hits, then carry over the last hit. For example, a three axle vehicle will
record as one and the Totalizer will hold the third hit in temporary memory
until the next vehicle passes over the tube. If the next vehicle also has an odd
number of axles, the count will correct itself. If not, the temporary memory
will retain the last axle hit until it can correct itself.
Loop Data: Vehicle by Vehicle Volumes
Totalizers that are equipped for loop data collection must be connected to a
loop detector. These loops are made of wire and are installed in a location
where traffic volume needs to be measured. An electric current running
through the loop creates a static magnetic field that the Totalizer, when
properly tuned, will monitor. A vehicle passing over the loop causes a
disruption in the field which causes the Totalizer to increment by one. The
Totalizer will not monitor for additional counts until the loop’s magnetic
field has returned to its static state. As a result, volumes are recorded on a
vehicle by vehicle basis, with no regard to vehicle size or the number of
axles. In other words, a passenger car is counted the same (one) as a tractor
trailer (one).