The ornamental design for the “curb ramp”, as shown and described.
FIG. 1 is a top plan view of a curb ramp showing my design;
FIG. 2 is a bottom view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof; and,
FIG. 6 is a right side view thereof.
The broken horizontal lines in FIG. 1 symbolically represent that the raised diamond pattern is repeated and extends over the entire upper surface of the curb ramp. The dashed lines in FIG. 2 indicate disclaimed features forming no part of the design of the present invention.
The raised diamond pattern is repeated and extends over the entire upper surface of the curb ramp; raised diamond features have been omitted for ease of illustration.