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Compensatory behavior for mental workload induced by freeway destination signs.

Lian Xie1,2, Guangluo Li2, Chaozhong Wu3,4

  • 1School of Civil Engineering, Hunan City University, Yiyang, Hunan, China.

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Area of Science:

  • Human Factors
  • Cognitive Psychology
  • Traffic Safety Engineering

Background:

  • Exit ramps are hazardous due to information overload from destination signs.
  • This overload can cause driver stress and errors.

Purpose of the Study:

  • Examine cognitive workload imposed by destination signs.
  • Investigate driver compensatory behaviors to mitigate workload.

Main Methods:

  • Simulated driving experiment with 45 participants.
  • Manipulated information levels on destination signs.
  • Measured workload (NASA-TLX, heart rate variability, eye movements) and compensatory behaviors (speed, headway).

Main Results:

  • Subjective workload increased with sign information complexity.
  • Longitudinal deceleration was the primary compensatory strategy, increasing headway.
  • No significant differences in compensatory strategy effectiveness between professional and nonprofessional drivers.

Conclusions:

  • Driver effort increases with workload; compensatory behavior reduces workload.
  • Deceleration is an effective strategy for managing destination sign information overload.
  • Findings inform traffic sign design for improved road safety.