Effects of variable message signs for slippery road conditions on reported driver behaviour |
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| Institution: | 1. University of Zagreb, Faculty of Transport and Traffic Sciences, Zagreb, Croatia;2. Sveti Duh University Hospital, Department of Neurology, Zagreb, Croatia;1. Beijing Engineering Research Center of Urban Transportation Maintenance and Operations, College of Metropolitan Transportation, Beijing University of Technology, Beijing, 100124, PR China;2. The Texas Department of Transportation, 9500 N. Lake Creek Parkway, Austin, TX, 78717, USA;1. Sarasota Orthopedic Associates, Sarasota, FL;2. Logan Regional Orthopedics, Logan, UT;1. Urban Design 4 Health, Inc., USA;2. University of Tennessee, Knoxville, TN 37996, USA;3. Department of Civil & Environmental Engineering, The University of Tennessee, USA;1. Hanyang University Erica Campus, Department of Transportation and Logistics Engineering, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, Republic of Korea;2. Transportation Safety Research and Development Institute, Korea Transportation Safety Authority, 17, Hyeksin 6-ro, Gimchen-si, Gyeongsangbuk-do 39660, Republic of Korea;3. Villanova University, Department of Civil and Environmental Engineering, Room 152, Tolentine Hall, 800 E. Lancaster Avenue, Villanova, PA 19085, United States |
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| Abstract: | A field study by Rämä and Kulmala (Rämä, P., Kulmala, R. (2000). Effects of variable message signs for slippery road conditions on driving speed and headways. Transportation Research, Part F, 3, 85–94.) showed that a variable message sign warning about slippery road conditions reduced the mean speed by 1–2 km/h. The study also showed that a variable message sign recommending a minimum headway between vehicles decreased the proportion of short headways. However, the signs may have other effects on driver behaviour besides those measurable in terms of speed and headway, and this study was designed to investigate such potential effects. In total, 114 drivers who had encountered the slippery road condition sign and 111 drivers who had encountered the sign showing recommended minimum headway in adverse road surface conditions were interviewed. The results suggested that these variable message signs do indeed have other effects, such as the refocusing of attention to seek cues on potential hazards, testing the slipperiness of the road, and more careful passing behaviour. On the other hand, the results suggested that driving speed and headway are essential variables with which many other variables correlate. |
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