Impact of Distracted Driving on Congestion

Stavrinos, Despina; Garner, Annie A.; Franklin, Crystal A.; Ball, David; Ball, Karlene K.; Sisiopiku, Virginia; Fine, Philip R. · 2011 · ROSA P / University Transportation Center for Alabama

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Summary

This study investigates the under-researched link between distracted driving and traffic congestion, addressing the gap in literature that primarily focuses on safety outcomes. While previous research established that distractions like cell phone use impair driving safety, their impact on traffic flow efficiency remained unclear. The authors hypothesized that distracted driving induces inefficiencies—such as slower speeds and reduced lane changes—that obstruct traffic flow, with text messaging expected to have the most detrimental effect due to combined cognitive and motor demands. The researchers employed a driving simulator study involving 75 participants aged 16–25, divided into novice drivers (16–18) and young adults (19–25). Participants completed three 30-minute driving scenarios on a four-lane divided roadway, each representing different Levels of Service (LOS): free flow (LOS A), stable flow (LOS C), and oversaturation (LOS E). Each participant drove under three randomly assigned conditions: undistracted, talking on a cell phone, and texting. Safety metrics included vehicle collisions and lane deviations, while traffic flow metrics included speed fluctuation, lane-change frequency, time to complete the scenario, and the number of vehicles passed or passing the participant. Data were analyzed using Repeated Measures Multivariate Analysis of Variance for continuous variables and Generalized Estimate Equation Poisson models for count variables. Results indicated that distracted driving, particularly texting, significantly negatively impacted traffic flow. Participants exhibited greater speed fluctuations, changed lanes significantly fewer times, and took longer to complete driving scenarios when distracted. Consequently, more simulated vehicles passed the participant drivers during texting and cell phone conditions compared to the undistracted condition. Regarding safety, lane deviations were significantly higher during texting and undistracted conditions compared to cell phone use, though no significant association was found between distraction type and total vehicle collisions. Notably, no significant differences were detected between the novice and young adult age groups, suggesting that distraction impairs traffic flow and safety similarly across these demographics. The study concludes that distracted driving, especially text messaging, reduces both safety and traffic flow efficiency, thereby contributing to congestion. By demonstrating that distracted drivers create obstructions through erratic speed and reduced lane maneuvering, the findings imply that distracted driving is a factor in traffic incidents and congestion. These results support the integration of traffic flow considerations into distracted driving research and policy, highlighting that interventions aimed at reducing distraction may also alleviate congestion and improve overall traffic operations.

Key finding

Text messaging caused significantly more lane deviations than cell phone use and negatively impacted traffic flow by increasing speed fluctuations, reducing lane changes, and extending scenario completion times.

Methodology

simulator

Sample size: 75

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• traffic density
• visual
• mobile phones
• visual manual
• temporal
• manual

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).

• Empirical Findings: observational prevalence, behavioral performance data
• Theoretical Contribution: conceptual framework