Abstract
Autonomous vehicle (AV) technology is developing rapidly. Level 3 automation assumes the user might need to respond to requests to retake control. Levels 4 (high automation) and 5 (full automation) do not require human monitoring of the driving task or systems [1]: the AV handles driving functions and makes decisions based on continuously updated information. A gradual switch in the role of the human within the vehicle from active controller to passive passenger comes with uncertainty in terms of trust, which will likely be a key barrier to acceptability, adoption and continued use [2]. Few studies have investigated trust in AVs and these have tended to use driving simulators with Level 3 automation [3, 4]. The current study used both a driving simulator and autonomous road vehicle. Both were operating at Level 3 autonomy although did not require intervention from the user; much like Level 4 systems. Forty-six participants completed road circuits (UK-based) with both platforms. Trust was measured immediately after different types of turns at a priority T-junction, increasing in complexity: e.g., driving left or right out of a T-junction; turning right into a T-junction; presence of oncoming/crossing vehicles. Trust was high across platforms: higher in the simulator for some events and higher in the road AV for others. Generally, and often irrespective of platform, trust was higher for turns involving an oncoming/crossing vehicle(s) than without traffic, possibly because the turn felt more controlled as the simulator and road AVs always yielded, resulting in a delayed maneuver. We also found multiple positive relationships between trust in automation and technology, and trust ratings for most T-junction turn events across platforms. The assessment of trust was successful and the novel findings are important to those designing, developing and testing AVs with users in mind. Undertaking a trial of this scale is complex and caution should be exercised about over-generalizing the findings.
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Acknowledgments
The study forms part of an Innovate UK research project - VENTURER: Introducing driverless cars to UK roads (2015–18). See http://www.venturer-cars.com/. We thank Andrew Stinchcombe, Jason Welsby, Dr Martin Pearson, and Dr Tom Kent (Bristol Robotics Laboratory) for assisting with programming the autonomous elements of the driving scenarios and Gary Cross and Mark Goodall (BAe Systems) for further developing the road based autonomous vehicle since the first major Trial in 2016 (see [6]) including work on the DMS. We also thank a number of people (simulator and road teams) for assisting with the running of participants within the current trial, including: Charlie Humphries, Conor Ogilvie-Davidson, Katerina Stankova, Laura Bishop, Mikel Gomez de Segura Marauri, Ilaria Argiolas, and Peter Martin.
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Morgan, P.L., Williams, C., Flower, J., Alford, C., Parkin, J. (2019). Trust in an Autonomously Driven Simulator and Vehicle Performing Maneuvers at a T-Junction with and Without Other Vehicles. In: Stanton, N. (eds) Advances in Human Aspects of Transportation. AHFE 2018. Advances in Intelligent Systems and Computing, vol 786. Springer, Cham. https://doi.org/10.1007/978-3-319-93885-1_33
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