Real Time Bicycle Simulation Study of Bicyclists Behaviors and their Implication on Safety
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1 Real Time Bicycle Simulation Study of Bicyclists Behaviors and their Implication on Safety JUNE 30, 2017 Valerian Kwigizile, Jun-Seok Oh, Pavel Ikonomov, Raed Hasan, Cole G. Villalobos, Aous Hammad Kurdi, and Anil Shaw Western Michigan University
2 Outline Introduction and Background Literature Review Simulator Setup and Design of Experiments Data Collection and Analysis Conclusions and Recommendations Transportation Research Centre for Livable Community Western Michigan University 2
3 Research Objectives Build a bicycle simulator with virtual simulation Investigate how bicycle safety is impacted by interactions with pedestrians and motor vehicles. Examined bicyclists perceptions and reactions to different situations when riding a bicycle. 3
4 Outline Introduction and Background Literature Review Simulator Setup and Design of Experiments Data Collection and Analysis Conclusions and Recommendations Transportation Research Centre for Livable Community Western Michigan University 4
5 Research Gap Deep understanding of cyclist behavior in a virtual world setting Exploitation of modern technologies (simulation and human sensing) 5
6 Outline Introduction and Background Literature Review Simulator Setup and Design of Experiments Data Collection and Analysis Conclusions and Recommendations Transportation Research Centre for Livable Community Western Michigan University 6
7 Bicycle simulator setup Bicycle simulator setup 7
8 Integrated Experimentation System System architecture Integrated system Flow of inputs and outputs Virtual Reality Glasses EEG Headset Computer Monitor Rear Wheel Sensor Bicycle Platform Steering Sensor 8
9 Study Location The study site was located on the Western Michigan University campus 9
10 Overview of Scenario Design 1.Bicyclist s gap acceptance behaviors when crossing intersections. 2.Bicyclist s behavior when merging and sharing a lane with motor vehicles. 3.Bicyclist s reaction to individual pedestrians at a crosswalk. 4.Bicyclist s reaction to groups of pedestrians at a crosswalk. 10
11 Outline Introduction and Background Literature Review Simulator Setup and Design of Experiments Data Collection and Analysis Conclusions and Recommendations Transportation Research Centre for Livable Community Western Michigan University 11
12 Collecting Field Data for Simulation Summary of Subject Identifications Gender Male 22 61% Female 14 39% Other 0 0% Total % Biking level Beginner 9 25% Experienced 27 75% Total % Age 25 or younger 12 33% 26 or older 24 67% Total % 12
13 The program interface recording brain signals The EEG signals were recorded by an Epoc+ device (from Emotiv) which contained 14 electrodes with two reference points. The TestBench program displays real-time data stream including EEG, FFT, Gyro, Motion, Data Packet, contact quality, and battery level of the headset The sampling rate is 128 samples per second. The EEG waves (i.e. frequency, location, and amplitude) recorded by electrodes are used to indicate the cognitive state of people. 13
14 Names (IDs) and locations of signal electrodes For the purposes of this study, electrodes AF3, F3, AF4, and F4 were chosen. 14
15 Time-frequency for scenarios for electrodes AF3 and F3 15
16 Time-frequency for scenarios for electrodes AF4 and FF4 16
17 Analysis of Survey and Simulation Data Did the cyclist stop or slow down? Slow 44% Stop 56% Bicyclist s action on approaching the intersection (Scenario 1) 17
18 Potential gaps (in sec) available to subjects Gap Gap Gap Gap Gap Gap Gap Gap Gap Gap Gap
19 Gap acceptance results Reject Accept 9% 31% 36% 91% 69% 64% Under 3 Seconds 3 to 4 Seconds Over 4 Seconds Gap Acceptance analysis results 19
20 Analysis of Brain Activity (EEG) Data One of the objectives of this study was to detect and analyze the cyclic cognitive responses of cyclists to various traffic events. This was achieved by observing the differences in energy and frequency of the EEG signals in each scenario and compare those differences with the age, gender, and skill level claimed by the subjects examined. 20
21 Analysis of Brain Activity (EEG) Data Brain activity analyses were conducted in the before, during and after a specified event/scenario. For example, in the first scenario, time-frequency representations of power changes were determined before entering the intersection, during the entry into the intersection and then after traversing the intersection. 21
22 Analysis of Brain Activity (EEG) Data Power Usage (db) Brain Power usage based on age L-AF3-B L-F3-B R-AF4-B R-F4-B L-AF3-B L-F3-B R-AF4-B R-F4-B L-AF3-B L-F3-B R-AF4-B R-F4-B L-AF3-B L-F3-B R-AF4-B R-F4-B Sc1 Sc2 Sc3 Sc4 Brain Location Per Scenario 25 or younger 26 or older Total Relationship between brain activity and age of cyclist in the before stage 22
23 Analysis of Brain Activity (EEG) Data 12.0 Brain Power usage based on age 10.0 Power Usage (db) L-AF3-T L-F3-T R-AF4-T R-F4-T L-AF3-T L-F3-T R-AF4-T R-F4-T L-AF3-T L-F3-T R-AF4-T R-F4-T L-AF3-T L-F3-T R-AF4-T R-F4-T Sc1 Sc2 Sc3 Sc4 Brain Location Per Scenario <= Grand Total Relationship between brain activity and age of cyclist in the Through stage 23
24 Analysis of Brain Activity (EEG) Data Brain power usage based on biking level 12.0 Power Usage (db) L-AF3-T L-F3-T R-AF4-T R-F4-T Brain Power usage based Biking Level Beginner Expert Intermediate Grand Total Relationship between brain activity and biking level for Scenario 1 24
25 Analysis of Brain Activity (EEG) Data Power Usage (db) Brain power usage based on biking level 0.0 L-AF3-T L-F3-T R-AF4-T R-F4-T Brain Power usage based Biking Level Beginner Expert Intermediate Grand Total Relationship between brain activity and biking level for Scenario 2 25
26 Outline Introduction and Background Literature Review Simulator Setup and Design of Experiments Data Collection and Analysis Conclusions and Recommendations Transportation Research Centre for Livable Community Western Michigan University 26
27 Conclusions 1. The study results indicate that the simulator developed can be used to study gap acceptance. 2. The results also showed that both male and female positioned similarly when riding a bicycle in a shared lane. 3. the majority of beginners (56 percent) rode on the right side of the shared lane compared to only 36 percent of experienced cyclists. While there was no beginner, who rode on the left side of the shared lane while 16 percent of experienced cyclists rode on the left side of the lane. 4. Analysis of brain activity showed that energy use was mostly higher for persons aged 26 or older than those age 25 or younger in before and during stages of events, respectively, especially in scenario 1 5. This finding suggests that cyclists age 26 and older paid more attention as they rode the bicycle, which could signify more careful bicycle riding. 6. Cyclists who claimed to be experts had lower power usage compared to other cyclists. 27
28 Recommendations for Future Research Shared lanes are a huge concern in the biking community. Some bicyclists insist on riding in the middle of the lane regardless of where the signs are placed to increase their visibility. A simulation study to research the vehicle's response to the bicyclist riding in different locations would increase and help promote a change to place the signs in the best locations for both the bicyclists and the vehicles may be needed. This driving simulator could be used to measure the distance between the vehicle and the bicyclist. To achieve this, integration of bicycle and vehicle simulator may be important. 28
29 Thank you 29
Real Time Bicycle Simulation Study of Bicyclists Behaviors and their Implication on Safety
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