Wavetronix SmartSensor HD - Page 5

SmartSensor HD
5
SmartSensor HD Bid Specification
1.0 General. is item shall govern the purchase of aboveground radar vehicle sensing devices (RVSD) equivalent to the Wa-
vetronix SmartSensor™ HD.
An RVSD detects vehicles by transmitting electromagnetic radar signals through the air. e signals bounce o vehicles in their
paths and part of the signal is returned to the RVSD. e returned signals are then processed to determine trac parameters.
RVSDs are not aected by normal weather and environmental conditions such as rain, wind, snow, dust, etc. ey also do not
require cleaning and can maintain performance over a wide range of ambient temperatures.
RVSDs provide a non-intrusive means of detecting trac because they can be installed at the side of a roadway. is property not
only makes them safer to install but also more cost eective than sensors that require roadway modications or placement.
2.0 Measured Quantities. e RVSD shall provide volume, average speed, occupancy, classication counts, 85th percentile speed,
average headway, average gap, speed bin counts and direction counts for user-congurable time intervals for up to 22 lanes of
trac.
e RVSD shall provide up to eight length-based classication bins.
e RVSD shall provide up to 15 speed bins.
e RVSD shall provide speed, length, class, lane assignment, and range data for each vehicle detection.
e RVSD shall provide presence data for up to 22 lanes of trac.
3.0 Detectable Area.
3.1 Maximum Lanes. e RVSD shall be able to detect and report information from up to 22 lanes.
3.2 Detection Range. e RVSD shall be able to detect and report information in lanes with boundaries as close as 6 ft.
(1.8 m) from the base of the pole on which the RVSD is mounted.
e RVSD shall be able to detect and report information in lanes located with the far boundary at 250 ft. (76.2 m) from
the base of the pole on which the RVSD is mounted.
e RVSD shall be able to simultaneously detect and report information from a lane located at the minimum oset and
from a lane located at the maximum range.
3.3 Lane Size and Spacing. e RVSD shall allow any spacing of trac lanes positioned from the minimum oset to
the maximum range. Gore and unequally sized or spaced lanes shall be handled so that detections from the lanes meet all
performance specications.
Not all roadways have lanes that lie on evenly spaced intervals. Some roadways have gore, odd-sized medians and unequal lane
sizes. An RVSD should be able to handle all these cases.
3.4 Barrier Performance. e RVSD shall detect vehicles with the specied accuracy in lanes that are adjacent to a barrier
when 50% of a sedan is visible over the barrier from the point of view of the RVSD.
4.0 Performance.
4.1 Volume Accuracy. e volume data shall be within 5% of truth for a direction of travel during nominal conditions. In-
dividual lane volume data shall be within 10% of truth during nominal conditions. e percentage of missed detection and
the percentage of false detections for each lane shall not exceed 15% during nominal conditions. Nominal conditions exist
when average speeds are greater than 10 mph (16 kph) in every lane; when there is less than 20% truck trac per lane; and