The ornamental design for a motorcyclehighwaybar, as shown and described.
FIG. 1 is a front view of my motorcycle highway bar.
FIG. 2 is a rear view of the motorcycle highway bar.
FIG. 3 is a right-side view of the motorcycle highway bar.
FIG. 4 is a left-side view of the motorcycle highway bar.
FIG. 5 is a top-view of the motorcycle highway bar.
FIG. 6 is a bottom view of the motorcycle highway bar; and,
FIG. 7 is a perspective view of the motorcycle highway bar.
The broken line showing the SOFTAIL block letters is for the purpose of illustrating portions of the motorcycle highway bar that forms no part of the claimed design.