Can organisational safety climate and occupational stress predict work-related driver fatigue

1. Can organisational safety climate and occupational stress predict work-related driver fatigue Speaker: Jenny 2008/12/24 Transportation Research Part F 11 (2008) 418–426 Clint Strahan, Barry Watson, Alexia Lennonb

2. Objective • Evaluate the influence of occupational stress and organizational safety climate on fatigue-related driving behavior • Evaluate whether these variables could predict self-reported near misses that were attributed to driver fatigue

3. Outline • Objective • Introduction • Method • Results • Conclusions

4. Introduction • Work-related vehicle crashes have been reported as the leading cause of work-related injury and death in many countries. (Pratt, 2003; Charbotel et al., 2001) • Cost of Crashes: 15 billion • Organizations play an important role in affecting the safety behaviors. • This research focused on high-risk groups such as long distance truck drivers.

5. Introduction • Driver fatigue: (Stutts et al., 2003) • Sleep • Psychological: anxiety, depression • Personality: sensation seeking • Occupational stress (Cushway, Tyler, & Nolan, 1996) • Physical consumption • Emotional drain • Absenteeism • Reduced efficiency and performance

6. Introduction • Occupational stressors contribute to decreased driving performance and vigilance, therefore increase in crash risk. (Legree et al., 2003) • Safety climate: perceptions of the way in which the organisation views and manage safety • Safety climate could significantly predict driver safety-related behaviors, like traffic violation, driving error, distraction.

7. Method • Participants: 219 • Response: 15% (1458 surveys) • Mean age: 42.6 • 53% male + 46.1% female

8. Method--measures • Control variables • Age, gender, and time spent driving for work per week • Occupational stress • job-related tension scale (JRTS) • 5-point Likert Scale (never—always) • Subjective stress

9. Method--meaures • Safety climate • Safety climate questionnaire • 7-point Likert scale • 35 items • 6 dimensions (alpha=0.97) • communication and procedures, work pressure, management commitment, relationships, driver training, safety rules

10. Method--measures • Self-reported, fatigue-related behavior • 5-point scale • Driving after working and insufficient sleep • Alpha= 0.82 • Self-reported, fatigue-related near misses • Question • Whether they had experienced a near misses because of fatigue in past 6 months

11. Method-- Data analysis • Hierarchical regression analysis • predict fatigue-related driver behavior • control variable • Logistic regression • Predict self-reported near misses

12. Results

13. Results

14. Results

15. Conclusions • low response rate • work environment influences work-related driver fatigue • Strategy: organizational factors to fatigue risk • Organizations can partly reduce fatigue-related crashes through safety climate and occupational stress. • Management: take active stances in formulating safety policies and showing organizations commitment

16. Thank You!