Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
barrier [ˈbærɪər] n (at entrance) барье́р; (at frontier) шлагба́ум; (BRIT) (also: crash barrier) предохрани́тельный барье́р на шоссе́ и доро́гах; (fig, to progress etc) препя́тствие; (:to communication) поме́ха
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.