The ornamental design for a trafficconeholder, as shown and described.
FIG. 1 is a perspective view of the traffic cone holder of my new design showing it attached to the rear of a truck.
FIG. 2 is a perspective view of the traffic cone holder of my new design showing an arm of the cone holder in an un-locked position.
FIG. 3 is a perspective view thereof showing the arm in a vertical, locked position.
FIG. 4 is an elevational view from the right side thereof.
FIG. 5 is an elevational view from the left side thereof.
FIG. 6 is a front elevational view thereof.
FIG. 7 is a rear elevational view thereof.
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is a top plan view thereof.
The broken line figures shown in FIG. 1, depicting a truck with traffic cones positioned in the rear thereof, are environmental elements and are not a part of my new design.