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Articles

An empirical assessment of driver motivation and emotional states in perceived safety margins under varied driving conditions

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Pages 256-267 | Received 10 Mar 2012, Accepted 08 Oct 2012, Published online: 12 Dec 2012
 

Abstract

Motivation models in driving behaviour postulate that driver motives and emotional states dictate risk tolerance under various traffic conditions. The present study used time and driver performance-based payment systems to manipulate motivation and risk-taking behaviour. Ten participants drove to a predefined location in a simulated driving environment. Traffic patterns (density and velocity) were manipulated to cause driver behaviour adjustments due to the need to conform with the social norms of the roadway. The driving environment complexity was investigated as a mediating factor in risk tolerance. Results revealed the performance-based payment system to closely relate to risk-taking behaviour as compared with the time-based payment system. Drivers conformed with social norms associated with specific traffic patterns. Higher roadway complexity led to a more conservative safety margins and speeds. This research contributes to the further development of motivational models of driver behaviour.

Practitioner Summary: This study provides empirical justification for two motivation factors in driver risk-taking decisions, including compliance with social norm and emotions triggered by incentives. Environment complexity was identified as a mediating factor in motivational behaviour model. This study also recommended safety margin measures sensitive to changes in driver risk tolerance.

Acknowledgements

The College of Engineering and Edward P. Fitts Department of Industrial & Systems Engineering at North Carolina State University provided support for this research. During the course of the project, the first author worked as a research assistant in the ISE Ergonomics Lab with partial support through the Ergonomics Center of North Carolina for her Masters studies.

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