JS-32 CREW WAS DIRECTED TO TURN IN CONTRADICTION TO THE OBSTACLE CLRNC PROC AT ABE.

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OBSTACLE DEP STATES THAT DEPARTING ACFT FROM ABE RWY 24 SHOULD FLY RWY HDG TO 1600 FT PRIOR TO TURNING. WE WERE CLRED FOR TKOF ON RWY 24 AND ADVISED THAT A CESSNA WAS ON APCH TO OPPOSITE RWY 6; 6 MI OUT ON FINAL. ONCE ON THE RWY; THE TWR CTLR ADVISED US THAT THE CESSNA WAS A CITATION. PART OF THE TKOF CLRNC INCLUDED A TURN TO A 270 DEG HDG. AT ALL TIMES DID WE MAINTAIN AWARENESS OF WHERE THE CITATION WAS. ACCORDING TO THE OBSTACLE DEP; WE INITIATED A TURN AT APPROX 1600 FT. THE TWR CTLR WAS NOTICABLY ANNOYED AND ASKED US IF WE WERE AWARE OF THE HDG ASSIGNMENT OF 270 DEG. HE ALSO DID MENTION THAT THERE WAS SEPARATION. WITH THE ARRIVING CITATION IN HINDSIGHT WE COULD HAVE INITIATED THE R TURN SOONER SINCE WE WERE IN VMC CONDITIONS; HOWEVER AT NO POINT DID THE CTLR SPECIFY AN IMMEDIATE TURN AFTER TKOF. THE ARPT FAC WAS BY NO MEANS; VERY BUSY WITH TFC AND WE THOUGHT THE CTLR COULD ALSO HAVE REQUESTED A TURN ONCE AIRBORNE. HOWEVER; AS PLTS WE COULD HAVE REQUESTED A CLARIFICATION EITHER BEFORE OR AFTER TKOF. AS TO WHEN TO BEGIN OUR TURN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CREW HAD A CAREFUL BRIEFING BEFORE DEP REGARDING THE OBSTACLE DEP PROC LISTED ON THE COMMERCIAL ARPT PLATE PAGE. SINCE THEY WERE SOUTHBOUND THEY FELT UNCOMFORTABLE IN IGNORING A PUBLISHED PROC. THE CAPT WENT BACK TO THE TWR FREQ TO EXPLAIN CONCERNS TO THE CTLR. THE COMPANY CHIEF PLT WAS BRIEFED. NOTHING MORE HAS BEEN HEARD.