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Measuring Stress Levels for real-world on-road cyclists: do bicycle facilities, intersections and traffic levels affect cyclists' stress?

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Alvaro Caviedes, Portland State University

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Measuring Stress Levels for real-world on-road cyclists: do bicycle facilities, intersections and traffic levels affect cyclists' stress?

  1. 1. Measuring Stress Levels for real-world on-road cyclists: do bicycle facilities, intersections and traffic levels affect cyclists' stress? Alvaro Caviedes, Miguel Figliozzi, Hoang Le, Feng Liu and Wu-chi Feng
  2. 2. Safety Stress Comfort Source: Portland bicycle tours
  3. 3. Naturalistic Non-naturalistic
  4. 4. Bicycle Level of Stress The term “stress” can be defined as “the non-specific mix of physiological and psychological responses of the body to any demand of change” (Seyle, 1956) This study addresses the question of how the characteristics of a bicycle trip affect stress levels using physiological data, specifically Galvanic Skin Response (GSR).
  5. 5. Research questions 1. Does peak traffic impact stress levels? 2. Do intersections impact stress levels? 3. Does facility type or proximity to motorized traffic impact stress levels?
  6. 6. GSR • Skin conductance • Sweat gland activity • Emotional arousal leads to an increase in skin conductance Lie detector Source: Business insider Source: Shimmer
  7. 7. From Kael Greco
  8. 8. METHODOLOGY Pilot study 6 subjects Peak and off-peak hour 30 minutes ride (4.5 km)
  9. 9. Multi-use path Bike laneShared roadway
  10. 10. EQUIPMENT
  11. 11. EQUIPMENT
  12. 12. RESULTS
  13. 13. Does peak traffic impact stress levels? YES Average response ratios during peak hours are 17% greater than response ratios at off-peak hours with a significant difference (p-value < 0.01)
  14. 14. Do intersections impact stress levels? YES Average response ratios were 12% greater for intersections than for segments of the route, with a significant difference (p- value < 0.01) Source: Google Street view
  15. 15. Does facility type or proximity to motorized traffic impact? stress levels? YES The findings suggest that separated facilities were associated with lower response ratios than other facilities. (e.g. On-street response ratio was 10% times greater than off-street response ratio )
  16. 16. Model 1 Model 2 Model 3 Model 4 Peak hour +++ +++ +++ +++ Signalized intersection + +++ + + Facility Type Bike Lane +++ +++ Shared roadway - Multi-use path +++ +++ + p-value<0.05 +++ p-value<0.01 - Non-significant +++ p-value <0.05 + p-value <0.01 - Non-significant
  17. 17. CONCLUSIONS Findings Bike Design Suitability of GSR data to study cyclists’ stress levels Statistical difference between time of the day, intersection vs segment, and type of segment Cyclist priority at busy intersections Physically separated facilities Bike Lane type consideration

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