Effectiveness of an improved road safety policy in Ethiopia: an interrupted time series study

Abegaz, Teferi; Berhane, Yemane; Worku, Alemayehu; Assrat, Abebe · 2014 · Crossref

DOI: 10.1186/1471-2458-14-539

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Summary

This study evaluates the effectiveness of an improved road safety policy implemented in Ethiopia’s Oromia Regional State, addressing a critical gap in evidence regarding the impact of such regulations in low-income countries. While high-income nations have seen significant reductions in road traffic injuries through enforced safety laws, developing nations like Ethiopia face rising crash rates due to rapid vehicle ownership growth. The research specifically assesses whether the Oromia Regional State Road Transport Regulation No. 96/2007, enforced from September 2007, reduced crashes, injuries, and fatalities on the Addis Ababa–Adama/Hawassa highway, a major economic corridor. The researchers employed an interrupted time series design using segmented linear regression to analyze routine traffic accident data from 2002 to 2011. Data were collected from sixteen traffic police offices along the 264-kilometer highway, supplemented by average daily vehicle flow statistics from the Ethiopian Road Authority. The intervention introduced new laws prohibiting cell phone use while driving, unbelted driving, and unhelmeted motorcycle riding, while increasing penalties for speeding, impaired driving, and unsafe loading. Enforcement included roadside random checks for seat belts and helmets, though speed and alcohol enforcement were limited by a lack of radar and breathalyzer equipment. Statistical models controlled for underlying trends and autocorrelation, analyzing monthly rates of non-injury crashes, fatalities, and injuries per 10,000 vehicles. The study recorded 4,053 crashes over the ten-year period, resulting in 1,392 fatalities and 1,749 injuries. The analysis revealed statistically significant reductions in both non-injury crashes and fatalities following the policy implementation. Specifically, non-injury crashes decreased by 19.2% (101 fewer crashes per 10,000 vehicles monthly) and fatalities dropped by 12.4% (from a predicted 178 to an observed 156 deaths per 10,000 vehicles after one year). However, the policy had no statistically significant effect on reducing non-fatal injuries. The fatality rate remained abnormally high compared to national averages, partly due to the high traffic volume and diverse mix of vehicles and pedestrians on this key import-export route. The findings indicate that stricter road safety regulations can effectively reduce crashes and deaths in low-income settings, but the overall incidence remains dangerously high. The authors attribute the modest impact on fatalities to poor enforcement of speed limits and impaired driving, hindered by a lack of technical enforcement tools and legal frameworks. They conclude that further action is required, including public awareness campaigns, inter-sectoral collaboration, and the provision of appropriate control devices to achieve more substantial reductions in road traffic mortality.

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Topics

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• comparative international
• regulatory evaluation
• fatality injury trends
• demographic disparities
• adas effectiveness
• incidence prevalence

Information type

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• Applied Guidance: countermeasure evaluation
• Empirical Findings: crash risk outcomes