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Intelligent and Safer Junctions, Supporting Safer Cycling
3rd – 4th November, 2016 @ Bolonga Italy
John McLaughlin [email protected], Dr. Steven Davy [email protected], Frances Cleary [email protected], David Ryan [email protected]
Programmable Automomous Systems Unit
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Introduction,
• About TSSG: TSSG is a telecommunications research institute attached to Waterford Institute of Technology, established in 1996, in South East Ireland.
• Aim: The aim of the project was to research a sensor based system to detect the presence of cyclists at roundabout junctions and devise a system to generate alerts specific to the affected area on the junction.
www.tssg.org 2
Intelligent and Safer Junctions, Supporting Safer Cycling
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Key Outputs
• To assess if Bluetooth Beacon Technology is suitable for cyclist detection at roundabout junctions.
• To develop a low cost, light weight system for creating alerts at the separate junctions on a roundabout based on the cyclist’s trajectory.
www.tssg.org 3
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Safer Cycling Use Case
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System Architecture
May 2, 2023
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Cyclist Location Sensing Beacon Approach
• Tags Strategically Positioned • Signal Received by smart device carried by cyclist• The position of cyclist is computed by trilateration.
• The position of the cyclist to the Bluetooth tag is determined• When the position of the cyclist is determined in relation to at
least 3 tags the position of the cyclist is known by the system
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GPS Location Sensing Approach
• This method exploits GPS technology on device held by the cyclist.
• A manifest of junctions is sent to the mobile device from the Listening Service.
• The app determines, using mathematics, the current GPS position and the manifest, the relevant junction and once within a nominal distance the application begins to stream the current GPS position to the Listening Service
www.tssg.org 7
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Junction Zones
• Virtual Zones added to Junction using a purposely built online map tool
• These zones are used to define the transition of the cyclist on the junction within the system.
• They form the basis of the policy and alerting system
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The policies are a set of rules that, based on a transition between zones define whatalerts are sent to the junction
Policies & Alerts
Rule : [Zone 2 -> Zone 3]
ALERTS : [ Zone 5 -> Zone 7 ]
Rule : [Zone 3 -> Zone 7]
ALERTS : [ Zone 8 -> Zone 10 ]
CANCEL : [Zone 2 -> Zone 3]
Rule : [Zone 7 -> Zone 10]
ALERTS : [ Zone 2 -> Zone 3 ]
CANCEL : [Zone 5 -> Zone 7]
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Findings
• At speeds of 15km and 20km the cyclist was detected.
• The height of the Bluetooth Beacons were crucial to the detection with 1.2m being the optimum.
• Sufficient rate of detection was achieved by this method to accurately detect the cyclist’s trajectory through the junction.
• The detected trajectory determined by trilateration was similar to the trajectory determined by the Garmin 500 unit that was used as a comparison.
Bluetooth Beacon Technology Assessment
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Findings
• The key component to the system was the zone transition and policy system.
• GPS Based Location sensing was deemed a more stable and lower cost solution to the Bluetooth Beacon Technology
• GPS signal and adequate internet connectivity is key to the success of the system.
Development of low cost cyclist detection system
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Conclusion
• For 100% cyclist detection it requires all cyclists to use the system i.e. use one of the cyclist detection mechanisms.
• Extra trials required to test the system in a real world scenario to determine if the system would be suitable in a complex urban environment.
• From a proof of concept perspective the system provides a low cost, light weight solution to making roundabout junctions more intelligent and potentially safer for cyclists
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DELIVERING SCIENCE TO SHAPE YOUR FUTURE.
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