Solar road marker question

	What is the light beam's power source?
	How is the LED illuminated solar road marker more effective than the conventional reflective road marker when it comes to improving road safety?
	In wet conditions, is the Miracle solar road stud more effective than the conventional reflective road stud?
	How about in foggy conditions?
	If the LED light failed to operate for some reason, is the public safety compromised in any way?

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