عنوان مقاله [English]
The human factor, vehicle, road and environment are involved in accidents that the environmental factors and climate phenomena to account for a significant share. The risk of weather affecting road transport, Thunderstorm storms can occur, Heavy rains and flash floods, dust storms, Fog and falling snow and avalanches noted that the slippery road surface, Reduce driver visibility and focus on the occurrence of road accidents increase. The assessment and analysis of the frequency of occurrence and geographical factors threatening the transport network and road Installation of safety equipment in critical areas can greatly reduce the occurrence of such accidents. In this study, the frequency of occurrence of weather phenomena affecting road transport and highways and major roads in the entire country. Using data collected from weather stations across the country and synoptic data from meteorological satellites was studied. Phenomena of weather and climate disasters and the types of indicators were used to identify them: Heavy precipitation (rainfall less than 30 mm high and 90 th percentile precipitation), Ice (start, end, duration and frequency of frost occurrence), thunderstorm wind (direction and speed and the frequency of occurrence of winds), Dust storm (dust phenomenon aerosol optical thickness), fog (visibility less than 1 km and the frequency of occurrence of short-clouds), flooding (flood rate rise basin) and snow and avalanches (frequency of occurrence of snowfall) . Spatial analysis of climate data and hazard zonation using ARCGIS software interpolation methods were used in and Highways and main roads in the country in terms of climatic disasters and the degree of risk they were classified. Also, to facilitate comprehensive and timely information, the information layer, designing a web-based software by Internet portals such as WISroGIS It was loaded into a live Atlas hospitalized for easy access to contents provided Atlas.