Specifications

WISCONSIN DEPARTMENT OF BID #268246 TRAFFIC DATA RECORDERS
TRANSPORTATION PAGE 7 OF 23
Recorders must be capable of supporting alternate sensor configurations through the use of
optional plug-in sensor modules listed above without requiring any firmware changes.
Each sensor module must be able to have its firmware upgraded by the user.
All loop, piezoelectric, and external contact inputs must use AMP Circular Plastic Connectors size
series 11 chassis connector part number 206486-1.
The serial communications input must use AMP Circular Plastic Connectors size series 11 chassis
connector part number 205841-1.
The Wisconsin Department of Transportation has invested considerable time and resources in our
existing data collection facilities which contain thousands of detectors and will not accept other
connectors or adapters for the connection of the sensors to the recorder.
5.8 Count Rate:
Two hundred counts per second.
5.9 Time Keeping
Each recorder must have an onboard real time clock calendar independent of the main processor
operation and battery. The clock must be a twenty-four hour time clock with hours, minutes and
seconds. The calendar must output the day, month and year, compensating for leap year and
daylight saving time. The recording interval must be selectable between one and 1440 minutes.
Each unit must have a selectable on/off adjustment for daylight saving time change.
5.10 Accuracy
The units selected for purchase under the resulting contract must be capable of accurately
recording and classifying a minimum of 95% of the vehicles being monitored. It must also meet the
accuracy requirements for the Highway Performance Monitoring System as specified by the
Federal Highway Administration. Units must be capable of classifying up to four (4) lanes of traffic
simultaneously, either traveling in same, or opposite, directions. Accuracy will be checked and
verified by comparing the data collected with manual counts and counts made with existing
equipment.
5.11 Configuration
Each unit must be capable of storing data by lane or by direction in an individual bin or all lanes in
a single bin, and Per Vehicle Records (PVRs). Users must be able to view input activity via onboard
LCD display and/or laptop computer as it is being binned. Counters must be capable of storing
setup information, site number, configuration and count interval. Twelve alphanumeric characters
must be provided (each) for site identification and for station identification.
The classification table should allow a minimum of fifteen user definable types, with twenty-four
vehicle definitions, with FHWA Scheme “F” as default. Units must be capable of collecting at least
eight selectable multiple studies in one setup (i.e., speed, classification, volume, gap, headway,
and raw data as per-vehicle records at the same time), with the option to select individual or a
combination of reports via PC software. When the loop detectors are installed, the unit must be
capable of performing length based classification using only two inductive loops per travel lane.
Field employees must be able to modify class tables without any firmware, hardware or chip
changes.