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Case study of the effects of the weather conditions on the road accidents in the mountainous area of Iran : Haraz Road Nokhandan, Majid Habibi ; Alijani, Bohloud ; Jamali, Javad Bodagh

By: Contributor(s): Language: English Language: French Series: ; topic V-179Publication details: XIth international winter road congress 2002, Sapporo [Japan] / XIe congres international de la viabilite hivernale 2002, Sapporo [Japon]. Paper, 2002Description: 4 sSubject(s): Bibl.nr: VTI 2002.0071Location: Abstract: The traffic safety of the mountainous roads is often in danger of extreme weather condition such as freezing and temperature variations especially in winter conditions. Most of the roads of IRAN are located in the mountainous areas which cause economic and human losses. This study was undertaken to identify these extreme conditions and develop an early warning system to forecast them temporary and spatially. The Haraz road between Tehran (capital of IRAN) and Amol (located on the Caspian Coast) was taken as a sample of the mountainous roads of IRAN , the hourly weather data of Abali station in Haraz road were acquired from the meteorological organization of IRAN for the month December to April of 1990 to 1996. The hourly accidents data for the same period were provided by the ministry of road and transportation. First the daily accidents were classified according to reported weather conditions. Then the frequency of accidents for each weather condition was computed on the monthly and whole period basis. The result showed that 75 percent of the accidents happened during the raining days with the temperature between minus 7 to 0 Celsius. On the monthly basis, March showed the highest accidents frequency which was followed by December. Based on the result of this study and in order to establish an early warning system a numerical weather forecast model for the roads of IRAN was developed. In order to better implementation of this model it was suggested that the number of road weather stations should be increased.
Item type: Reports, conferences, monographs
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The traffic safety of the mountainous roads is often in danger of extreme weather condition such as freezing and temperature variations especially in winter conditions. Most of the roads of IRAN are located in the mountainous areas which cause economic and human losses. This study was undertaken to identify these extreme conditions and develop an early warning system to forecast them temporary and spatially. The Haraz road between Tehran (capital of IRAN) and Amol (located on the Caspian Coast) was taken as a sample of the mountainous roads of IRAN , the hourly weather data of Abali station in Haraz road were acquired from the meteorological organization of IRAN for the month December to April of 1990 to 1996. The hourly accidents data for the same period were provided by the ministry of road and transportation. First the daily accidents were classified according to reported weather conditions. Then the frequency of accidents for each weather condition was computed on the monthly and whole period basis. The result showed that 75 percent of the accidents happened during the raining days with the temperature between minus 7 to 0 Celsius. On the monthly basis, March showed the highest accidents frequency which was followed by December. Based on the result of this study and in order to establish an early warning system a numerical weather forecast model for the roads of IRAN was developed. In order to better implementation of this model it was suggested that the number of road weather stations should be increased.

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