Naturalistic Study of Level 2 Driving Automation Functions

This document presents methods and results for the Naturalistic Study of Level 2 Driving Automation Functions (L2 NDS). The objective of the L2 NDS project was to investigate, through a naturalistic driving study (NDS), real-world driver interaction with commercially available driving automation systems. Ten vehicles equipped with both lateral and longitudinal automated features were instrumented and loaned to participants for a 4-week period. A total of 120 drivers were recruited over a 14-month data collection period. Participants drove 216,585 miles, with 70,384 miles driven with both lateral and longitudinal control features active. Drivers were observed engaging in non-driving tasks, but these were not related to feature use. Driver behavior was consistent with active driving/supervision of the automated features; drivers were receptive to Request to Intervene (RTI) alerts. No RTIs were associated with any Safety-Critical Events (SCEs; Crashes and Near-Crashes). In total, 5 minor crashes (no injury or visible damage) and 66 near-crashes were observed across the entire data set. No statistical relationship was observed between SCE rates and feature activation level. A sub-study specifically focused on longer drives was also conducted. Results observed in the sub-study were similar to those observed in the broader NDS. Implications per the study research questions are presented herein. Comparisons to related research studies and limitations of the current research effort are also discussed


  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 179p

Subject/Index Terms

Filing Info

  • Accession Number: 01715392
  • Record Type: Publication
  • Report/Paper Numbers: DOT HS 812 642
  • Contract Numbers: DTNH2214D00328L, Task Order #1
  • Created Date: Aug 20 2019 9:00AM