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Driving behavior on the winter road surface in Sapporo city Tokunaga, Roberto Abraham et al

By: Language: English Language: French Series: ; topic III-178Publication details: XIth international winter road congress 2002. Sapporo [Japan] / XIe congres international de la viabilite hivernale 2002, Sapporo [Japon]. Paper, 2002Description: 11 sSubject(s): Bibl.nr: VTI 2002.0071Location: Abstract: This study was performed to examine how different winter road surface management levels affect skid number and driving behaviour. Furthermore in this study was examined the relationship between the skid number and driving behaviour. The skid number, velocity and acceleration were measured by a skid-testing vehicle developed by Hokkaido University and an experimental vehicle equipped with sensors and data recorder. As the skid resistance value of the road surface, we used the skid number, which is the longitudinal skid resistance value when the tire is completely locked. The acceleration and velocity of the vehicle were measured excluding conditions of traffic congestion and emergency, i.e. the measured vehicle behaviour did not include the influences of surrounding traffic. On all the test sections, acceleration tended to decrease as the skid resistance number decreased. Acceleration was greater on an upward slope than on a downward slope. The reason is thought to be that the accelerator was often depressed when starting the vehicle on the upward slope and this increased the pitching of chassis. On the downward slope, the pitching of the chassis was small because the vehicle accelerated only releasing the brake pedal. Although deceleration decreased as the skid number decreased, deceleration on the downward slope exceeded that on the upward slope, in contrast to the case of acceleration. The reason is thought to be that the pitching of the chassis was increased by the application of stronger braking due to the downward slope. Travelling velocity did not tend to decrease when the skid number decreased. However, velocity tended to decrease on the downward slope when the skid number decreased to 40 or less. At any rate, the influence of the skid number on velocity was small. Finally, from these results it can be said that the skid number allows the most direct estimation of road surface conditions. It was verified that the influences of driving and road traffic conditions should be considered when driving behaviour is used to understand the influence of road management level.
Item type: Reports, conferences, monographs
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This study was performed to examine how different winter road surface management levels affect skid number and driving behaviour. Furthermore in this study was examined the relationship between the skid number and driving behaviour. The skid number, velocity and acceleration were measured by a skid-testing vehicle developed by Hokkaido University and an experimental vehicle equipped with sensors and data recorder. As the skid resistance value of the road surface, we used the skid number, which is the longitudinal skid resistance value when the tire is completely locked. The acceleration and velocity of the vehicle were measured excluding conditions of traffic congestion and emergency, i.e. the measured vehicle behaviour did not include the influences of surrounding traffic. On all the test sections, acceleration tended to decrease as the skid resistance number decreased. Acceleration was greater on an upward slope than on a downward slope. The reason is thought to be that the accelerator was often depressed when starting the vehicle on the upward slope and this increased the pitching of chassis. On the downward slope, the pitching of the chassis was small because the vehicle accelerated only releasing the brake pedal. Although deceleration decreased as the skid number decreased, deceleration on the downward slope exceeded that on the upward slope, in contrast to the case of acceleration. The reason is thought to be that the pitching of the chassis was increased by the application of stronger braking due to the downward slope. Travelling velocity did not tend to decrease when the skid number decreased. However, velocity tended to decrease on the downward slope when the skid number decreased to 40 or less. At any rate, the influence of the skid number on velocity was small. Finally, from these results it can be said that the skid number allows the most direct estimation of road surface conditions. It was verified that the influences of driving and road traffic conditions should be considered when driving behaviour is used to understand the influence of road management level.

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