Abstract
Drivers’ instantaneous decisions regarding speed and acceleration/deceleration, as well as the time rate of acceleration change (jerk) can result in a volatility driving behaviour with significant impact on cyclist safety. The contribution of this article is the assessment of driving volatility in motor vehicle (MV)-bicycle interactions at two-lane roundabouts. Traffic flow and bicycle GPS data were collected from two two-lane roundabouts. Then, traffic, emissions and safety models were used to evaluate volatility impacts on safety, pollutant emissions and traffic performance. The findings showed jerk have an impact on driving volatility between MVs and bicycles, regardless of roundabout design with higher amplitude of variation for MVs. However, MVs had higher acceleration–deceleration variation than bicycles.
Highlights
The main objective of this paper is the assessment of driving volatility in motor vehicle (MV)-bicycle interactions at two-lane roundabouts and its impacts on safety, pollutant emissions and traffic performance
Traffic flow and bicycle GPS data were collected from two two-lane roundabouts in the city of Aveiro, Portugal
A description of the different operational and behavior variables, such as entry and exit traffic flows, bicycle volumes, acceleration-deceleration rates and unexpected maneuvers experienced by drivers and cyclists was developed
Summary
Safety benefits of roundabouts for motor vehicles are well-documented [1], these are not always extensive to bicycles [2]. One of the main reasons may be the unexpected driving volatility of motor vehicle (MV)-bicycle interaction at roundabouts.
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