Paving Tape
From Woodland Scenics:
Use this adhesive-backed foam tape to create straight-edged forms for paving, even on curves. Model streets, roads, sidewalks and parking lots. Easy to apply and remove. Includes Spreader.
Roll makes a road approximately 15' long (4.57 m)
1/4" w x 1/16" h x 30' l (6 mm x 1.5 mm x 9.14 m)