This paper presents an experimental study carried out in various road sections by means of an original methodology. The authors acquired video-camera recordings and processed data by means of a semi-automatic procedure in order to obtain the speed and position of every vehicle. The research was preceded by a first phase where measurements were taken and evaluated for a better knowledge of the conditioning effects on the users. Afterwards, various devices and special arrangements of signaling were experimented upon in a given road section. By doing so, it was calculated, at each installation, the modifications induced on the vehicles' motion, in terms of speed and transversal position, under various environmental and temporal conditions (day and night lighting). The authors studied a straight road section, during three different traffic flows, under four lighting and four weather conditions. They worked on a total of 6,000 vehicles, comprising four different typologies. Results show the effectiveness of different tested configurations, and indicate, under each environmental and temporal condition, the most appropriate equipment for better management of vehicular speed and transversal position.