Instruction manual

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Note that the directional lane is not an actual separate lane – it is the same physical lane but simply traffic moving in the

opposite direction. It is recommended that the directional option be used whenever the possibility of two-way traffic

exists, such as a one-lane road or an area on a two lane highway where there is much passing of slower vehicles,

thereby using the oncoming lane.

Four separate modes of Per-Vehicle (Raw) Storage are available. Lanes are not individually set; all lanes will be in the

same mode.

Normal

This is a straight Per Vehicle mode which will store lane number, time (to the second),

speed, number of axles, and spacing between each axle.

Enhanced

This data is in the same format as Normal with the exception that the time includes the

one hundredths of a second, speed is now calculated to tenths of a MPH (or KPH) and

the overall vehicle length axle is added to the record.

Raw with Bins

The data is the same as Normal except the Speed, Axles, Length, Gap, and Headway bin

numbers are stored with each record based on the current bin tables in the unit. This

format does not store the data in binned format, but will tell you what bin a vehicle would

have gone into if you were binning (this storage format is not recommended as binning

can be executed directly in the Centurion software).

Enhanced with

Bins

This format is a combination (as the name implies) of Enhanced and Raw with Bins. The

data is now Enhanced and stored with the bin numbers.

Basic Loop Class

This allows units with the I-loop installed to collect standard loop classification data. Loop

classification data consists of the corresponding Axle class data without the use of Axle

sensors. A 64-bit ID code is stored along with the vehicle record for classification

identification of each vehicle and class refinement in the Centurion software.

Advanced Loop

Class

This is the same as the basic loop class data except is also contains the full vehicle

signature along with the 64-bit code. This is used for fine tuning of the loop class system

in the software and for vehicle processing and visualization of vehicle classes and other

applications such as third party software.

There is some give and take with the modes. Enhanced Raw will give a more precise record than Normal Raw;

however, more memory space is used. The same comment goes for Raw with Bins – more memory to keep track of

which bin it would have gone into. Appendix B gives an approximation of the number of vehicles which can be stored in

memory depending upon which mode you choose.

While in Raw Storage, the user can select any of the seven Sensor Modes (Axle-Axle, Loop-Loop, etc.) for each lane.

The system will ask the user for Sensor Spacing and the Loop Length. The maximum sensor spacing is 99.9 feet, and

the maximum loop length is 25.5 feet.

Per-Vehicle (Raw) Storage also supports “Lane Overlap”. If axle sensors are used to collect data from two lanes of

traffic, the Lanes can be configured as shown in the figures below. Note that the shorter tube is in the near lane (lane #

1), and is activated first by oncoming traffic. This configuration will allow you to collect data from two lanes using four

road tubes where one set of tubes crosses both lanes.

Same Direction

Opposite Direction

As shown, lane overlap can support lanes where vehicles are going the same or opposite direction.