Here's a photo of the donkey bead, hanging from the rear-view mirror of the cab.

There is a long Middle Eastern tradition of using blue beads to ward off the evil eye. What are called "donkey beads" from Iran (modern versions of old faience beads), clearly were used to protect valued draft animals. Today, a car has a similar value to a person, and also needs protection. Thus this use of the bead inside a car. (Note also the Coco Chanel rhinestone piece!)

Jamey