Driver Expectations for System Control Errors, Driver Engagement, and Crash Avoidance in Level 2 Driving Automation Systems

Many vehicles available to consumers offer some level of automated lateral and longitudinal driving functionality. The capabilities of these vehicles vary widely among both vehicle makes and models. Drivers may or may not have preconceived expectations about how these driver assistance systems function. This project tested 96 participants in vehicles equipped with SAE Level 2 driving automation systems of different capabilities. To evaluate the effects of driver expectations, participant training was either congruent or incongruent with system capabilities, creating a four-condition between-subjects factor. Testing was conducted on public roads and on the Virginia Smart Road test track. While on the test track, participants were asked to complete non-driving tasks while driving, and mid-way through the driving session experienced a surprise event (crash-imminent scenario). Analyses focused on summary measures of driver engagement behaviors such as driver hands on steering wheel behavior and subjective measures of automation acceptance and engagement. Response times to surprise events were also compared between expectation levels. Results indicate that driver training can have an effect on driver engagement on public roads that is independent from vehicle capabilities.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Maps; Photos; References; Tables;
  • Pagination: 93p

Subject/Index Terms

Filing Info

  • Accession Number: 01767940
  • Record Type: Publication
  • Report/Paper Numbers: DOT HS 812982
  • Created Date: Mar 18 2021 12:18PM