Transportation engineering, road safety, surveys

Speed analysis on urban roads sections start from need tied up to traffic assignment models in urban networks: to calculate the average running time in a road section it is necessary to have a good evaluation of average running speed for that road section. First experimentations for the study of drivers «realized» speed (for rural roads) have been published already in 1988. In 1997 it has been published a first expression for «realized» speed in function of curvature (1/R) and of absolute value of the longitudinal road gradient for some typologies of common rural roads.