Sensys Stud Trial - Sensys Networks

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Sensys Stud Trial 2. Introduction 2.1 Background Inductive loops have been used as the primary method for detection vehicle presence on the Auckland motorway network for a number of years. While the technology is accurate and reliable it does come with a few disadvantages: • They are easily damaged by resurfacing works. • Installing them requires a significant cost in traffic management, and associated disruption to the road user. • The current inductive loops detector station only report back to a single system. This leads to the use of two different sets of loops in the road surface. A system that is not damaged by resurfacing, is easy to install and can communicate to both the ATMS and SCATS systems would be an improvement to the current arrangement. The Sensys studs offer all these advantages. 2.2 Technology Summary The Sensys Wireless Vehicle Detection System can be used in traffic monitoring and management applications as a direct replacement for conventional inductive loops. Like inductive loops, Sensys wireless sensors can be located exactly where measurements are required; whether it is at a specific through lane, turn lane, or entrance or exit ramp. The Sensys Wireless Vehicle Detection System employs ruggedised in-pavement-mounted magneto-resistive sensors to detect the presence and movement of vehicles. The Sensys vehicle sensors are wireless, transmitting their real-time detection data via radio to a nearby Sensys access point that then communicates the data to a local traffic controller, to a remote traffic management system, or to both at once. The low-power circuitry gives an average battery life of a sensor is 10 years. When power is getting low a message is sent allowing planned replacements without outages. A Sensys access point can collect detection data from many Sensys wireless sensors, either directly from sensors within a range of approximately 45 meters (depending on the mounting height of the access point) or from sensors supported by one or more Sensys repeaters that are within a range of approximately 300 meters of the access point. Detection data collected by the Sensys access point can then be provided via contact closure interface to a roadside traffic controller or via IP (Internet Protocol) communications over twisted pair, coaxial cable, fibre optic cable, or wireless services to central facilities or via both data paths simultaneously. Commercial in Confidence Page 6
Sensys Stud Trial Figure 1. Typical Sensys Installation 2.3 Advantages of the Technology The access point is then connected to both a QTC controller allowing communication with SCATS as well as the Ethernet fibre backbone allowing data to be sent to an ATMS system. The SCATS system collects count and occupancy data while the ATMS system can collect count, occupancy, speed and classification data from the studs. As the sensor can be installed quickly in a 100mm diameter drill hole, road user disruption and the traffic management costs are significantly less than a standard induction loop as the installation operation can be undertaken using a semi-static closure. These can be placed at a depth of 120mm giving 70mm of clearance from the top of each sensor to the surface which should allow for resurfacing of up to 50mm without damage to the sensor. Unlike side mounted radar technology the sensor is mounted in-road and is therefore not susceptible to shadowing due to high sided vehicles. Also the technology is not affected by environmental conditions such as snow, fog or rain which affect most video detection systems. As the sensors are wireless the amount of ducting required along the motorway is greatly reduced. Commercial in Confidence Page 7
Page 1 and 2: Transfield Services Sensys Stud Tri
Page 3 and 4: Sensys Stud Trial Contents 1. Summa
Page 5: Sensys Stud Trial Stage 1 concluded
Page 9 and 10: Sensys Stud Trial 3.3 Equipment Set
Page 11 and 12: Sensys Stud Trial 3.4 Site Layout S
Page 13 and 14: Sensys Stud Trial 3.5 Installation
Page 15 and 16: Sensys Stud Trial 5. The sensor wil
Page 17 and 18: Sensys Stud Trial 4. Data Collectio
Page 19 and 20: Sensys Stud Trial 4.2 Data Collecti
Page 21 and 22: Sensys Stud Trial 5.1 First Set of
Page 23 and 24: Sensys Stud Trial 6. Cost Compariso
Page 25 and 26: Sensys Stud Trial 6.2 Cost Comparis
Page 27 and 28: Sensys Stud Trial 6.4 Cost Comparis
Page 29 and 30: Sensys Stud Trial 2 sites of 8 Lane
Page 31 and 32: Sensys Stud Trial 2 sites of 8 Lane
Page 33 and 34: Sensys Stud Trial Appendix A - Resu
Page 35 and 36: Sensys Stud Trial Appendix B - Resu
Page 37: Sensys Stud Trial Sensys Data Analy

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