A recent study published in Marketing Letters reveals a connection between the size of a vehicle and the driving habits of its owner. The study, conducted using national data from Israel, found that drivers of larger, heavier vehicles are more likely to receive speeding tickets, suggesting a tendency towards riskier driving behavior.
The research was sparked by the ongoing trend towards larger, heavier vehicles, such as SUVs and pickups, on the roads. While these vehicles are generally perceived to be safer for their occupants in the event of a crash, they pose a greater risk to pedestrians and other road users. The researchers wanted to understand if the increased sense of safety that comes with driving a larger vehicle could lead to more reckless driving habits.
The study leveraged comprehensive national data from the Ministry of Transport and Road Safety in Israel, encompassing all active passenger vehicles and police-issued speeding tickets over the course of 2018. This extensive dataset provided detailed information on each vehicle’s characteristics, such as mass, horsepower, fuel type, and the number of speeding tickets issued. The data represented 2,162,525 vehicles across 3,095 unique configurations, providing a robust foundation for the analysis.
To accurately determine the relationship between vehicle mass and speeding behavior, the researchers employed a two-stage least-squares (2SLS) regression model. This model was chosen to control for potential endogeneity, where riskier drivers might be more likely to purchase larger vehicles.
In the first stage, vehicle mass was predicted using an instrumental variable, the weighted average price of each vehicle configuration. In the second stage, the predicted vehicle mass was used to estimate its effect on the number of speeding tickets. This approach allowed the researchers to isolate the impact of vehicle size on speeding behavior while controlling for various other vehicle attributes such as horsepower, gear type, fuel type, and safety features.
The study revealed a significant positive association between vehicle mass and the number of speeding tickets. Specifically, the results indicated that for every one percent increase in vehicle mass, the expected number of speeding tickets per vehicle increased by 0.024. This suggests that drivers of larger, heavier vehicles are more prone to speeding violations.
Further analysis showed that this relationship held true across different types of traffic violations, not just speeding. This consistency across various infractions supports the notion that the perceived safety of larger vehicles leads to a broader increase in reckless driving behavior. For example, violations such as phone usage while driving, failure to fasten seatbelts, and disobeying traffic signals were also positively associated with vehicle mass.
To ensure robustness, the researchers conducted additional tests. They examined speeding tickets issued by both police cars and traffic enforcement cameras, finding consistent results across these different enforcement methods.
They also segmented the data by vehicle category and transmission type, observing the positive association between vehicle mass and speeding tickets in most segments. Moreover, an alternative instrumental variable, the vehicle’s towing capacity, was used in the analysis, and the findings remained consistent, further validating the robustness of the results.
The study, “Is vehicle weight associated with risky driving behavior? Analysis of complete national records,” was authored by Aviv Steren, Stav Rosenzweig, and Ofir D. Rubin.
