What is the purpose of this sign?

What is the purpose of this sign?

AThe speed limit on this road is 55 km/h and all traffic lights have cameras to monitor traffic.BYou may not drive through the green light, at the traffic signal, at a speed faster than 55 km/h.CTo inform you that the traffic signals on this route are coordinated and that the signals will be green at all the subsequent intersections if you maintain the indicated speed.

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