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			 The ornamental design for a road marker, as shown and described. 
			  
			  
			  
			  
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FIG. 1 is an upper perspective view of a road marker showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a right side elevational view thereof; and,
FIG. 8 is a bottom perspective view thereof.
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