“…Precipitation is the most significant and most studied weather factor, followed by snow, temperature, fog, wind, etc. Examples of such studies are: precipitation (Satterthwaite 1976;Brodsky and Hakkert 1988;Andrey and Yagar 1993;Edwards 1996;Andrey et al 2003;Keay and Simmonds 2006;Bijleveld and Churchill 2009); snow (Edwards, 1996;Nofal and Saeed, 1997;Brijs et al, 2008); a combination of snow and ice (Kallberg, 1996); temperature (Stern and Zehavi, 1990;Wyon et al 1996;Nofal and Saeed;1997); and strong wind (Baker and Reynolds, 1992;Young and Liesman, 2007). Many researchers find that the total number of road accidents increases with precipitation.…”