Sensys Stud Trial - Sensys Networks

Sensys Stud Trial
Stage 1 concluded that the Sensys detector is a well-designed and reliable detector under a
wide range of environmental conditions experienced in Australian cities. Stage 2 concluded
that, relative to inductive loops, Sensys counts were similar and that it was worthwhile to
move on to Stage 3 on-site tests. Stage 2 further reported that the sensitivity of a vehicle
detector making use of earth’s magnetic field is strongest at the south (or north) pole but
decreases towards the equator. Following from the results of Stages 1 and 2, a freeway test
site was selected near the Forster Road on- and off-ramps with the Monash Freeway in
Mount Waverley, Melbourne.
Stage 3 on the Monash Freeway in Melbourne compared the Sensys studs with inductive
loops and manual counts obtained from video recording. The key findings were:
• The data quality of occupancy and volume from the Sensys studs are comparable to
loop data quality. The speed data was more susceptible to vehicles changing lanes
as the data is from a pair of sensors.
• Sensys volume data was compared to manual counts and was found to be 2% larger
than true counts. The results are shown below:
Traffic
Parameters
Mean
Difference
0.3 veh/min
(Dry Days)
Volume 0.42
veh/min
(Wet Days)
Daily Levels
Mean %
Difference
2%
(Dry Days)
3%
(Wet Days)
Mean
Difference
0.31
veh/min
1 min Level
Mean %
Difference
Occupancy -1.20% -11% -1.10% -10%
Speed - - 1.29 km/h 1%
2%
• The detection zone of the Sensys stud is smaller than that of an inductive loop
detector due to physical size and technology used. The data analysis shows that at a
1 minute level the ratio of Sensys occupancy to loop occupancy is 0.713
• No significant difference was found between wet and dry days.
• There was a strong linear relationship between 2 detectors in a lane.
• Some sensor downtime was experienced however this was not quantified.
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Commercial in Confidence Page 5