1.   Miles of unbroken dunes extended to the horizon, peppered with occasional short, dark shrubs and the tread marks of military vehicles.

2.   The dashboard is scored with the dusty tread marks of her running shoes.

3.   Tire tread marks crisscrossed it.

4.   Tread marks were everywhere, and cars in their path were crushed.

5.   Fresh tread marks from an earthmover and a faint smell of decomposing bodies marked the site.