Funny silhouettes of Construction Machines in cartoon style. and some other equipment: hoisting crane, gibbet, estate car, caravan, excavator, lorry; truck, bulldozer. I think such vectors can be used by architecture related designer, or flash animation.

Also you can ungroup track’s parts and create your own unique bulldozer. BTW I also include *.SVG format, and will try to insert this format in all further freebies.