Pedestrian Injuries due to Single and Collision Accidents in Sweden’s Road Traffic Environment - Investigating the Magnitude, Risk Factors, and Potential Solutions
DOI: 10.59217/pjco2138
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Summary
This doctoral thesis by Khabat Amin addresses the epidemiology of pedestrian injuries in Sweden, specifically investigating both Pedestrian Single Accidents (PSAs), such as falls, and Pedestrian Collision Accidents (PCAs). The research is motivated by the historical exclusion of PSAs from official road traffic statistics, a gap stemming from definitions requiring vehicle involvement. This oversight has hindered the development of infrastructure and policy solutions for pedestrians, who are categorized as Vulnerable Road Users (VRUs). The study aims to quantify the magnitude of these injuries, identify risk factors, and evaluate the effectiveness of specific interventions to improve pedestrian safety, particularly for an aging population. The thesis comprises four papers utilizing data from the Swedish Traffic Accident Data Acquisition (STRADA) database, which records accidents reported by police and hospitals. Papers I and II are descriptive epidemiological studies analyzing national trends and clustering patterns. Paper III evaluates the impact of Automatic Emergency Braking (AEB) systems with pedestrian detection using real-world data and induced exposure analyses. Paper IV assesses the injury-reducing effect of heated pedestrian pavements, incorporating technical data on energy sources like ground source heat pumps. The analysis employs the Public Health Approach and Chain of Events theory to interpret findings. Key findings reveal that pedestrians constitute the largest group of injured road users and the second largest group of fatalities in Sweden. Paper I highlights that fall-related injuries are prevalent in urban areas during slippery conditions, disproportionately affecting women and individuals aged 50 and older. Paper II identifies that reversing accidents account for 12% of pedestrian collisions, with 2% resulting in fatalities. Cluster analysis identified four distinct groups, including elderly women with mobility aids injured in parking lots and men struck by reversing trucks. Paper III demonstrates that AEB systems reduce accident risk by 20%, with significant reductions at speeds between 10–50 km/h across various weather conditions, though effectiveness diminishes in darkness and at higher speeds. Notably, AEB did not reduce injury severity in collisions that did occur. Paper IV finds that heated pavements reduce fall-related injuries by 67–100%, proving cost-effective in cold climates, though ground source heat pumps offer greater scalability and efficiency compared to district heating. The thesis concludes that pedestrians remain a highly vulnerable group and that excluding single accidents from official statistics impedes the creation of safe urban environments. While AEB systems offer partial protection, their current effectiveness is insufficient for modern speed limits, necessitating further technological improvements. Heated surfaces are identified as a highly effective intervention for preventing falls. The author argues that redefining traffic accident definitions to include PSAs is essential for achieving Sustainable Development Goals related to urban well-being and road safety. Future efforts must prioritize reliable data collection, targeted infrastructure design, and systematic evaluation of interventions to mitigate risks for this growing demographic.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-20 |
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Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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