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學生 : 莊靖玟

In-vehicle workload assessment: Effects of traffic situations and cellular telephone use Bor-Shong Liua,*, Yung-Hui Leeb Journal of Safety Research 37 (2006) 99 – 105. 學生 : 莊靖玟. Methods - Participants. Twelve participants (6F ， 6M) .

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學生 : 莊靖玟

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  1. In-vehicle workload assessment: Effects of traffic situations and cellular telephone useBor-Shong Liua,*, Yung-Hui LeebJournal of Safety Research 37 (2006) 99 – 105 學生:莊靖玟

  2. Methods - Participants • Twelve participants (6F，6M) . • The age of the subjects ranged from 25 to 45years, average age was 35.2 years. • All participants had held a drivers license for at least two years and drove 5,000 km or more annually. • Each had owned a cellular phone for at least one year and regularly used it in vehicle.

  3. Methods - Experimental vehicle • Nissan Cefiro 3.0 • Nokia 3310 • Four CCD cameras • Video-recorder system • Portable ECG system, and an auxiliary Battery • Microphone • VHS recorder (Sony SL82K, Japan)

  4. Methods - Heart rate measurement • Heart rate was calculated from the ECG recordings by Cosmed software (Quark Windows 6.2) • Data were exported into Microsoft Excel for further analysis. • Resting heart rate subtracted from heart rate on driving with presence/absence of phone is defined as incremental heart rate.

  5. Methods - On-road tests ★ Driver workload was measured in two traffic situations. • First participants drove in each direction along a 7-km section of a three-lane road in Taipei city (speed limit 50 km/h) with 24 signalized intersections, and numerous buildings on both sides. • In the second situation, participants drove in each direction along a 22-km section of National Highway No.3A (Taipei Connection Route) with four-lanes (speed limit 100 km/h). ★ The experiment was conducted during off-peak daylight hours (10 a.m.–12 noon and 2 p.m.– 4 p.m.).

  6. Methods - On-road testsEach driver was asked to perform four of the following phone-based tasks, with their sequence also randomly determined:

  7. Methods - Measurement • (a) Driving performance: mean driving speed (km/h) SDSW (degrees) standard deviation of lane position (SDLP;cm) • (b) Task performance: test scores consisted of response time (sec) proportion of correct answers (%) • (c) Physiological responses: heart rate (HR; beats/min) incremental heart rate (DHR, beats/min)

  8. Results

  9. Results

  10. Results

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