You have started really playing interactively with your toy trucks. Before, you would just roll them back and forth, staring at the wheels or talking softly to the truck as it rolled. Now, your trucks have jobs and roles within a story. You are "on the way to a rescue", "stuck with a broken wheel", or "heading to the fire".
Along with this, you are fScinated with cords and strings. You wore them around and around and through the inside of the cab of the truck, then take the other end and coil it around the door knob, then say. "Oh no, I stuck! Help!"