Interaction between motor vehicles and bicycles at two-lane roundabouts: a driving volatility-based analysis

Area of Science:

• Traffic Engineering
• Road Safety
• Transportation Science

Background:

• Driving behavior, characterized by speed, acceleration, and jerk, significantly influences road safety, particularly in mixed traffic environments.
• Interactions between motor vehicles (MVs) and bicycles present unique safety challenges, especially at complex intersections like roundabouts.

Purpose of the Study:

• To assess the impact of driving volatility on cyclist safety at two-lane roundabouts.
• To evaluate the effects of driving volatility on pollutant emissions and traffic performance in MV-bicycle interactions.

Main Methods:

• Collected traffic flow and bicycle GPS data from two-lane roundabouts.
• Utilized traffic, emissions, and safety models to analyze driving volatility.
• Quantified variations in speed, acceleration, deceleration, and jerk for MVs and bicycles.

Main Results:

• Jerk significantly contributes to driving volatility in MV-bicycle interactions at roundabouts.
• Motor vehicles demonstrated a higher amplitude of variation in jerk compared to bicycles.
• Motor vehicles exhibited greater acceleration-deceleration variations than bicycles.

Conclusions:

• Driving volatility, influenced by jerk and acceleration variations, poses risks to cyclist safety at roundabouts.
• Understanding these dynamics is crucial for improving traffic safety and performance in mixed-traffic environments.