Wavetronix SmartSensor Advance Manual page 5

Bid specifications
1.0 General. This item shall govern the purchase of aboveground continuous tracking advance detector (CTAD) equivalent to the Wavetronix
SmartSensor Advance.
A CTAD detects vehicles by transmitting electromagnetic radar signals through the air. The signals bounce off vehicles in their paths and
part of the signal is returned to the CTAD.
The returned signals are then processed to determine traffic parameters. CTADs are not affected by normal weather and environmental
conditions such as rain, wind, dry snowfall, moist snowfall, dust, etc. They also do not require cleaning and can maintain performance over
a wide range of ambient temperatures.
CTADs provide a non-intrusive means of detecting traffic because they can be installed at the side of a roadway. This property not only
makes them safer to install but also more cost-effective than sensors that require roadway modifications or placement.
2.0 Measured quantities and outputs. The CTAD shall detect range and speed to the stop bar for vehicles or clusters of vehicles moving
in the user-selected direction of travel. The CTAD shall dynamically track and update the estimated time of arrival (ETA) for each vehicle as it
approaches the stop-bar; each newly-measured ETA result will be continually compared against the pre-determined ETA ranges that define
the dilemma zone, and a green light extension request will be provided to the controller when one or more vehicles are within that range.
The CTAD shall also detect instantaneous roadway efficiency.
Dynamic ETA tracking allows the sensor to adjust the ETA over time when approaching vehicles accelerate or decelerate. This allows the
ETA-based zone detections to be more accurate than single ETA figures based on spot-speeds from a single location.
The CTAD shall be able to simultaneously detect and report information from up to 25 vehicles on the roadway when they are serially se-
quenced between the near and far boundaries.
The CTAD shall turn on a zone output when the range, speed, ETA, and qualified count or instantaneous roadway efficiency requirements
for that zone are satisfied.
The CTAD shall turn on an alert output on when the userdefined zone output combinational logical is satisfied.
The CTAD shall turn on a normal channel output when any of the channel's alerts is on and the channel's delay and extend time constraints
are satisfied.
The CTAD shall turn on a latched channel output when the on alert is turned on and the delay time is satisfied. The CTAD shall turn off a
latched channel output when the off alert is turned on or the max timer expires and the extension time is satisfied.
Channel outputs are used to create contact closures which can be used as inputs into a traffic controller.
The CTAD shall provide vehicle call and extend data on up to eight channels that can be connected to contact closure modules compliant
with NEMA TS 1, NEMA TS 2, 170, and 2070 controller cabinets.
The CTAD shall be capable of providing data for each tracked detection over the serial ports.
The CTAD shall have Pulse channel outputs for intersection arrival-time information.
When vehicular track file data is available on the serial ports, the data is then available on the communications network without the use
of a traffic controller or a contact closure data recorder. Vehicular track file data is useful for traffic study applications and for performing
comparisons between traffic sensors.
3.0 Detectable area.
3.1 Mounting location. The CTAD shall be able to detect and report vehicle information when mounted within 50 ft. (15.2 m) of the
center of the lanes of interest.
The CTAD shall be able to detect and report vehicle information when mounted at heights up to 40 ft. (12.2 m) above the road surface.
SmartSensor Advance
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