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SmartSensor 105

SmartSensor 105 Bid Specication

1.0 General. This item shall govern the purchase of above-

ground radar vehicle sensing devices (RVSD) equivalent to the

Wavetronix SmartSensor 105.

An RVSD detects vehicles by transmiing electromagnetic

radar signals through the air. The signals bounce o vehicles

in their paths and part of the signal is returned to the RVSD.

The 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. They 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. This

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. The RVSD shall provide volume,

average speed, occupancy and classication counts for user-

congurable time intervals for up to 8 lanes of trac.

The RVSD shall provide up to 3 length-based classication

bins.

The RVSD shall provide duration, class and lane assignment

for each vehicle detection.

The RVSD shall provide presence data for up to 8 lanes of

trac.

3.0 Detectable Area.

3.1 Maximum Lanes. The RVSD shall be able to detect

and report information from up to 8 lanes.

3.2 Detection Range. The RVSD shall be able to detect

and report information in lanes with boundaries as close

as 9 ft. (2.7 m) from the base of the pole on which the

RVSD is mounted.

The RVSD shall be able to detect and report information

in lanes located with the far boundary at 200 ft. (61 m)

from the base of the pole on which the RVSD is mounted.

The 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. The 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. The 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, and trac is owing.

4.0 Performance.

4.1 Volume Accuracy. The volume data shall be within

5% of truth for a direction of travel during nominal condi-

tions. Individual lane volume data shall be within 10%

of truth during nominal conditions. The percentage of

missed detection and the percentage of false detections

for each lane shall not exceed 15% during nominal condi-

tions. Nominal conditions exist when average speeds are

greater than 10 mph (16 kph) in every lane; when there is

less than 10% truck trac per lane; and when at least 50

cars per lane are counted in the interval.

4.2 Speed Accuracy. Average speed data shall be accurate

to within 5 mph (8 kph) for any direction of travel when

there are more than 16 cars per lane in an interval. Aver-

age speed data for any individual lane shall be accurate to

within 10 mph (16 kph) when there are more than 16 cars

per lane in an interval.

4.3 Occupancy Accuracy. Occupancy data shall be within

10% of truth for any direction of travel on a roadway

during nominal conditions. For example, if the true oc-

cupancy in a lane is 20%, then the measured occupancy

shall be between 18% and 22%. Individual lane occupancy

shall be within 20% during nominal conditions. Nominal

conditions exist when true occupancy is less than 30%,

without merging trac; when average speeds are greater

then than 10 mph (16 kph) in every lane; and when there

is less than 10% truck trac per lane.

4.4 Classication Accuracy. The RVSD shall correctly

determine classication for 80% of detected vehicles when

the classication bins are at least 20 ft. (6.1 m) wide and

occupancy of all lanes is below 20%.

5.0 Performance Maintenance. The RVSD shall not require

cleaning or adjustment to maintain performance.

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