Meaning of the Sanskrit Word: rathya

  rathya—lanes and subways    SB 1.11.14
  rathya—and public roads    SB 8.15.16
  rathyā—highways    SB 4.9.57
  rathyā—a path for driving a chariot    SB 4.21.2

Can't find any compound Sanskrit words containing rathya.