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What determines drivers' speed? A replication of three behavioural adaptation experiments in a single driving
Timo Melman1, David A Abbink1, Marinus M van Paassen2
1a Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Delft , the Netherlands.
Ergonomics
|January 11, 2018
Summary
Drivers do not adjust speed based on perceived risk, effort, or safety margins. Instead, steering reversal rate appears to be a key factor in speed adaptation, according to driving simulator research.
Area of Science:
- Human-Computer Interaction
- Transportation Psychology
- Automotive Engineering
Background:
- Speed adaptation is a complex behavior influenced by multiple factors.
- Previous research has relied on measures like galvanic skin response (GSR), self-reported task effort (SRTE), and time-to-line-crossing (TLC).
- The validity of these measures in explaining speed adaptation has been questioned.
Purpose of the Study:
- To conceptually replicate previous speed adaptation experiments.
- To evaluate the effectiveness of GSR, SRTE, and TLC in explaining speed adaptation.
- To identify more reliable measures of speed adaptation.
Main Methods:
- A driving simulator study with 24 participants.
- Measurement of GSR, SRTE, and TLC under varying lane width conditions.
- Comparison of measures using a nonparametric index for constancy and sensitivity.
- Introduction of steering reversal rate as an additional measure.
Main Results:
- Participants increased speed in wider lanes, confirming speed adaptation.
- GSR, SRTE, and TLC did not provide conclusive evidence for speed adaptation.
- Steering reversal rate demonstrated superior sensitivity and constancy compared to other measures.
Conclusions:
- Experienced risk, task difficulty, and safety margins are not primary drivers of speed adaptation.
- Steering reversal rate offers a more robust explanation for speed adaptation.
- Further research should investigate the role of vehicle control activity in speed adaptation.