The speed of vehicular flow is one of the most important variables to characterize the quality of the service provided to road users, which not only greatly influences the determination of Capacity and Service Levels, but also, that through the knowledge of the operating speeds, the traffic speeds of the different elements that make up the geometric layout (curves and tangents in plan) and the design speed within a particular road section, it is possible to determine the consistency geometric design, which in general terms, expresses the degree of adequacy between the behaviour of the road and the expectations of the driver. .For this work, it is presented, from the determination of the operating speeds, obtained through the use of radar, the consistency in the geometric design along a road section located in the southwest of Colombia and developed in mountainous topography, in which it was possible to evidence the existence of inconsistency in the geometric design in a significant number of elements of the way, which can generate unsafe conditions for road users