The Smart and Autonomous stand-alone speed limit road sign according to the weather changes

Abstract

The degradation of the weather conditions is dangerous for driving and should incite drivers to reduce the car speed. The present work solves this problem of the speed limit in city road and highway by changing automatically the authorized speed with the weather conditions.

The new developed stand-alone speed limit road sign is intelligent and is capable to analyze the weather context using sensors, and to display the most adapted speed limit according to the surrounding environment. Several scenarios have been proposed to develop a pre industrialized prototype and to analyze them according to different criteria (cost, consumption, endurance and reliability). In addition, the system is an autonomous stand alone and uses the solar energy as source of supply. The pre-industrial prototype of the system was successfully achieved. However to develop a "low cost" system a new concept of meteorological sensors was done, for the low consumption of the display we use the LED (light emitting diode) components.