circumferential
1. [ adjective ] lying around or just outside the edges or outskirts
Examples:

"circumferential highways around cities"

Related terms: peripheral
2. [ noun ] (transportation) a road that takes traffic around the edge of a town
Synonyms: bypass ring_road
Related terms: road bypass
Similar spelling:   circumference
  circumstantial
  circumstantially
  circumvention
  circumspectly
  circumboreal
  circumstantiate