kružni

1. (shape or movement) circular; round
   Na kružnom toku skreni na drugi izlaz. — At the roundabout take the second exit.
   Ova linija je kružna i vraća se na Zeleni venac. — This line is circular and returns to Zeleni Venac.

Kružni tok means roundabout; kružno putovanje is a circular tour visiting several places and returning to the starting point (not a round trip there and back, cf. povratna karta).