A Diploma Thesis titled ‘Macroscopic correlation of weather conditions and accident risk and severity in the interurban road network of Greece’  was presented by Theodore Nikolopoulos in July 2004. The use of lognormal regression has been adopted and applied on the disaggregate road accident data for the period of 1992 – 1999 on the Patra – Athens – Thessaloniki – Evzoni road axis. The results suggested that low temperature leads to reduction in the number of accidents and the severity of accidents whilst it increases the risk for the 2-wheel vehicles.