The ornamental design for a vehiclelightbar, as shown and described.
FIG. 1 is a perspective view showing a vehicle light bar of the present invention;
FIG. 2 is a detailed front perspective view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a bottom view thereof.
In the drawings, the broken lines illustrate portions of the vehicle light bar that form no part of the claimed design. The vehicle light bar is shown with a symbolic break in its length; the appearance of any portion of the article between the wavy break lines forms no part of the claimed design.