The Survey of Frost and Sliding in Sanandaj andHamadan by Using Climatic conditions Matrix

Climatic factor and atmospheric phenomenas are the most effective factors ontransportation safety, and frost is most dangerous between them. It was used climaticconditions Matrix for temporal and spatial study frost phenomenas on Sanandaj-Hamadan Road. In this regard, it was collected and analyzed 3 temperature,precipitation and relative humidity daily data parameter of Sanandaj, Hamadan andGhorveh Synoptic Stations.Based on climatic conditions, N5 Atmospheric Situation and N6 are dangerouscondition for vehicle and transportation safety with concentrating Janiuary (9 days),Febrvary (5 days) and December (4 days) on Sanandaj- Hamadan Road. The start ofregional frost is late of September and March is ended, but hazardous frost for roadsafety is December.