CARGO FLT ON APCH ON VECTORS TO FINAL APCH HAS INCORRECT LOC INFO AND IS LINED UP WITH A HWY. THEY REQUEST HDG FROM TWR BUT MISCOM OCCURS AND CTLR CORRECTS THEIR HDG.

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ON APCH TO ROC; BOTH THE COPLT AND I HAD THE BEACON IN SIGHT AT APPROX 20 MI OUT. WE WERE RECEIVING VECTORS FOR THE VISUAL APCH TO RWY 4. I; AS THE PNF; TUNED AND IDENTED THE ILS FOR RWY 4. AT APPROX 15 MI OUT WE THOUGHT WE HAD THE RWY IN SIGHT; AND THE LOC CONFIRMED WHAT WE SAW. WE CALLED THE RWY IN SIGHT AND WERE CLRED FOR A VISUAL TO RWY 4. AT APPROX 10 MI OUT WE REALIZED WE WERE LINED UP ON A HWY WITH STREET LIGHTS ON BOTH SIDES. I ASKED THE CTLR TO RECOMMEND A HDG. HE SAID FLY HDG 140 DEGS UNTIL RWY 4 IS IN SIGHT. THE COPLT TURNED TO 140 DEGS AND I QUICKLY FOUND RWY 4. MY EYES WERE COMPLETELY OUTSIDE THE COCKPIT. I LOOKED INSIDE AND SAW THAT THE COPLT WAS NO LONGER ON HDG 140 DEGS. AS I WAS REACHING FOR THE PUSH-TO-TALK BUTTON TO CALL RWY 4 IN SIGHT; THE CTLR ASKED IF WE WERE STILL ON 140 DEGS. I CALLED THE FIELD IN SIGHT; AND BEGAN SCOLDING THE COPLT FOR NOT FLYING HDG 140 DEGS. AS I WAS SCOLDING THE COPLT; THE CTLR BEGAN SCOLDING US FOR NOT STAYING ON HDG. IN A POSTFLT CREW DEBRIEF; THE COPLT THOUGHT I HAD ASKED THE CTLR TO 'SUGGEST' A HDG; AND I ALSO THOUGHT THAT IS WHAT I HAD ASKED FOR. SHE ALSO ASSUMED WE WERE STILL CLRED FOR THE VISUAL APCH. THERE WAS A BREAKDOWN IN COM BTWN THE 3 PEOPLE INVOLVED (CAPT; COPLT; CTLR). WHEN I ASKED HIM TO SUGGEST A HDG; I SHOULD HAVE CLARIFIED IF IT WAS A VECTOR OR A SUGGESTION; ALSO; WERE WE STILL CLRED FOR THE VISUAL OR WAS THAT RESCINDED WHEN WE REALIZED WE WERE LINED UP ON A HWY? THE HWY THAT CLOSE TO THE RWY; ALONG WITH THE ERRONEOUS LOC SIGNALS WERE MAJOR FACTORS.