Panel with variable messages
The panels with variable messages (PMV) are control panels road designed to alert or inform the road user. A PMV can post a pictogram or messages written, which can be posted alternatively, or lit, or extinguished, or flickering according to the needs.
The PMV are posed on gantries overhanging the Chaussée S, particularly highway, on side brackets or posts.
The PMV are dynamic equipment which diffuse messages in real-time which must be in conformity with the standards, decrees and payments in force. These messages can carry on the characteristics of the automobile traffic, stoppers or decelerations, the conditions weather, fitted wet-rain, the Température, or delivering various informational messages, like the frequency Radio-Traffic, estimated run time, etc.
Several techniques of diffusion of the messages exist. The first panels of this type quite simply received their instruction of posting by ordinary Téléphone and Modem. The intrusion of pirate on these numbers, united with passwords sometimes too simple to find, gave sometimes place to quite strange messages in Paris. Currently the majority of the PMV respect the specifications EQUIDYN and of the strict standards which protect them from these risks.
Examples of panels with variable messages
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