Assessing driver behavior using shrp2 adverse weather data.

Area of Science:

• Traffic Safety Research
• Human Factors in Driving
• Accident Analysis

Background:

• Inclement weather significantly impacts driving conditions, affecting speed, awareness, and visibility.
• Understanding driver adaptation is crucial for developing effective safety measures.

Purpose of the Study:

• To investigate how drivers modify their behavior (speed, awareness, visibility) in response to changing road conditions and reduced visibility.
• To analyze data from weather-related crash and near-crash events to understand driver adaptation strategies.

Main Methods:

• Utilized data from the Second Strategic Highway Research Program (SHRP 2) Naturalistic Driving Study (NDS).
• Matched adverse-weather driving events with similar non-adverse-weather baseline scenarios for behavioral comparison.
• Analyzed driver behavior changes from normal to inclement-weather driving.

Main Results:

• Most weather-related crashes and near-crashes occurred in rain (over 88%), with only 12% in snow.
• Near-crashes were nearly twice as frequent as crashes, indicating successful evasive maneuvers by many drivers.
• Rear-end and sideswipe avoidance were common near-crash types, often linked to visibility issues during lane changes or merging.

Conclusions:

• Drivers frequently employ hard braking and swerving as evasive maneuvers when speed is not adequately adjusted for conditions.
• The findings highlight the need for driver education on strategic behavior in adverse weather.
• Results aim to guide drivers towards more confident and adaptive driving practices during inclement weather.