Sensys Stud Trial - Sensys Networks

Sensys Stud Trial
Executive Summary
Transfield Services along with New Zealand Transport Agency undertook a trial of the
Sensys Wireless Vehicle Detection System (Sensys studs) on Auckland’s motorway
carriageway.
The trial involved installing six Sensys studs at Penrose on the Southern Motorway, one pair
on each of the three northbound lanes. These studs were connected wirelessly to an
access point strapped to a roadside CCTV camera pole, and further connected, via network
cables, to the two networks inside the roadside cabinet, namely the TDM Ethernet Network
and the SCATS network.
Data from the Sensys was collected through these two systems as part of the trial. Two
tests were carried out:
1. The Sensys data collected via the SCATS network was compared with traditional
inductive loops for Occupancy and Count. The count average for these results gives
an average difference of 2.07% while the occupancy gives an average difference of
6.28%
2. Manual counts have also been undertaken to verify flow data from both Sensys and
inductive loops. The manual count showed that the Sensys counts were on average
1.5% different than actual counts and the difference for loops was 0.5%
Cost analysis has been undertaken showing the cost difference between inductive loops and
Sensys studs, this was provided to the New Zealand Transport Agency by Transfield
Services.
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