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classification for up to 8 lanes of traffic. Vehicle classification is user-defined and can be divided
into three length-based classes. Speed data collected by the SmartSensor is a running average
of 16 vehicles, independent of the time period. The speeds are recorded at the end of each
data interval and are stored accordingly. The SmartSensor is capable of collecting data on a
lane-by-lane basis, providing directional volumes, classifications, and speeds.
The SmartSensor can be operated from a side-fire position, which allows for a safe and
relatively quick deployment. This sensor has an “auto-calibration,” which detects passing cars
and assigns the respective lanes. The SmartSensor has an internal data storage capacity of
2,976 time intervals, with a minimum time interval of five seconds.
Wavetronix SmartSensor HD (125)
The SmartSensor HD is the upgraded version of the SmartSensor 105. It has a range of 250 ft
and is capable of detecting up to 10 lanes of traffic. The SmartSensor HD collects traffic
volume, individual vehicle speed, average and 85
th
percentile speed, average headway and
gap, occupancy, classification, and presence.
Similar to the SmartSensor 105, the SmartSensor HD can be operated from a side-fired
position, and has an “auto-calibration” configuration process. The vehicle classification of the
SmartSensor HD is capable of 8 length-based classes which are user-defined. All of the power
and connection/communication requirements are the same as the SmartSensor 105, which
allows existing conditions to be upgraded.
RTMS
The Remote Traffic Microwave Sensor (RTMS) is a data collection device which was developed
by Electronic Integrated Systems (EIS). The RTMS is similar to the SmartSensor in that it can
be configured to a side-fired mode, and collects data by using a radar beam and detecting the
reflections of passing vehicles.
The RTMS is capable of detecting up to 8 lanes of traffic, and has a range of 200 ft. It collects
data on vehicle volume, speed, occupancy and classification of 2, 4, or 6 length-based vehicle
classes. It has an external memory with a capacity of 4.125 MB, and can store up to 61,000
intervals with time intervals ranging from 10 seconds to 600 seconds.
The main installation requirement of a radar sensor relates to the sensor’s offset from the first
lane of travel. The allowable offset (same as clear zone) corresponds to a recommended
mounting height. To optimize the accuracy of the sensors, each vendor provides recommended
height-offset requirements (Table 1).
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