Impact of law enforcement and increased traffic fines policy on road traffic fatality, injuries and offenses in Iran: Interrupted time series analysis

Foroutaghe, Milad Delavary; Moghaddam, Abolfazl Mohammadzadeh; Fakoor, Vahid · 2020 · Crossref

DOI: 10.1371/journal.pone.0231182

archive: archived pipeline: cataloged verified

Get this paper ↗ (DOI — opens at the source; we link to it, we don't host it)

Summary

This study evaluates the effectiveness of two major traffic safety interventions in Iran: the implementation of stricter law enforcement on April 1, 2011, and the increase in traffic ticket fines on March 1, 2016. Motivated by high road traffic fatality rates in low- and middle-income countries and a gap in research regarding enforcement packages in developing nations, the authors aimed to quantify the impact of these policies on road traffic fatalities, injuries, and specific traffic offenses. The researchers employed an interrupted time series analysis using Seasonal Autoregressive Integrated Moving Average (SARIMA) models. Data were collected from the Iranian Legal Medicine Organization and the Iran Road Maintenance and Transportation Organization. The analysis covered monthly incidence rates of road traffic fatalities (categorized by urban, rural, and local rural roads) and injuries (categorized by gender) from March 2009 to February 2016. Additionally, data on rural traffic offenses—specifically speeding, illegal overtaking, and tailgating—were analyzed from March 2010 to February 2016. The study utilized level shift models to assess the immediate and sustained effects of the interventions, ensuring stationarity and residual normality through statistical tests. The results indicated that the first intervention (law enforcement) significantly reduced the incidence rate of total road traffic fatalities by 21.44%, rural fatalities by 21.25%, and urban fatalities by 26.75%. However, this intervention had no statistically significant effect on local rural road fatalities or road traffic injuries. The second intervention (increased fines) was effective only in reducing urban road traffic fatalities by 26.75%. Regarding traffic offenses, the increase in fines led to a substantial 42.8% reduction in illegal overtaking and a 10.54% reduction in speeding, though it did not significantly affect tailgating. The study also noted that while total injury rates increased slightly over the study period, male injury rates remained constant while female injury rates showed an upward trend that stabilized after 2013. The findings suggest that law enforcement and increased fines are effective tools for reducing road traffic fatalities and specific hazardous behaviors like speeding and illegal overtaking in Iran. However, the lack of impact on injuries and local rural fatalities highlights the need for targeted interventions. The authors conclude that future initiatives should focus on modifying the implementation of traffic interventions to address these gaps. The study also provides simulations for future interventions to help Iran meet its goal of reducing annual road traffic fatalities to 10,000 by 2027.

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed.

Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• fatality injury trends
• regulatory evaluation
• comparative international

Information type

What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).

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