The ornamental design for a portable trafficguard, as shown and described.
FIG. 1 is a perspective view of a portable traffic guard showing my new
design, with the broken line showing for illustrative purposes only and
forming no part of the claimed designs;
FIG. 2 is a top view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side elevational view thereof, with the left side being a
mirror image; and,