The ornamental design for a flatroadsign, as shown and described.
This application is a Continuation-in-part of my copending application Ser. No. D29/501,120 filed on Sep. 2, 2014.
FIG. 1 is a front plan view of the flat road sign;
FIG. 2 is a back plan view of the flat road sign;
FIG. 3 is a side plan view of the flat road sign thereof, viewed from the left of FIG. 1, the side plan view, viewed from the right being the mirror image; and,
FIG. 4 is a top plan view of the flat road sign of FIG. 1, the bottom side view being the same and the top plan view.