SAAB 340B FLC CAUSED A BEECH JET TO GO AROUND WHEN THEY COULD NOT COMPLY WITH AMENDED CLRNC FROM TWR AFTER LNDG.

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I WAS IN COMMAND AT AN SF340B SCHEDULED FLT. WE HAD BEEN CLRED TO LAND ON RWY 22 AT THE SPRINGFIELD; IL; CAPITAL ARPT. THE LNDG WAS MADE WITH NORMAL REVERSE AND BRAKING. I WAS PREPARING TO EXIT RWY 22; AT THE INTXN OF RWY 13 AND TXWY D (RWY 13 AND TXWY D INTERSECT RWY 22 AT THE SAME POINT); WHEN WE RECEIVED INSTRUCTIONS FROM TWR TO 'TURN L ON RWY 18; R ON TXWY A.' THIS CLRNC CONFUSED MYSELF AND THE FO; AS WE HAD ALREADY EXITED RWY 22. WE WERE THEN INSTRUCTED TO 'GO STRAIGHT ON RWY 18.' RWY 18 WAS NO LONGER ACCESSIBLE FROM OUR PRESENT POS ON RWY 13/TXWY D. A BEECH JET WAS LNDG RWY 13; AND EXECUTED A GAR DUE TO THE CONFLICT. I WOULD ESTIMATE THAT THE BEECH JET WAS APPROX 1/2 MI FINAL AT THE TIME OF ITS GAR. FACTORS CONTRIBUTING TO THIS INCIDENT INCLUDE: THE CLRNC 'L ON RWY 18; R ON TXWY A' GIVEN BY THE TWR IS ERRONEOUS. TXWY A DOES NOT INTERSECT RWY 18 AT ANY POINT. THE 2ND CLRNC 'STRAIGHT ON RWY 18' COULD NOT BE COMPLIED WITH GIVEN THAT WE NO LONGER HAD ACCESS TO RWY 18 FROM OUR PRESENT POS. WE WERE NEVER INFORMED THAT CONVERGING OPS WERE IN EFFECT. ONLY THE ATIS STATED THAT 'RWYS 22; 13 IN USE.' THE CLRNC GIVEN TO US BY TWR TO EXIT RWY 22; WHETHER ERRONEOUS OR NOT; WAS NOT GIVEN TO US UNTIL WE WERE IN THE PROCESS OF EXITING RWY 22 AT THE INTXN OF RWY 13/TXWY D. WE WERE NEVER INFORMED TO EXPECT AN EXTENDED ROLLOUT. THE INTXN WITH RWY 13/TXWY D WAS THE FIRST EXIT PATH AVAILABLE TO US AFTER THE ACFT HAD SLOWED TO TAXI SPD. WITH NO OTHER INSTRUCTION RECEIVED UP TO THAT POINT; EXITING AT THIS INTXN IS PRUDENT AND IS WHAT IS EXPECTED OF US AS PURSUANT TO GUIDANCE IN THE 'AERONAUTICAL INFO MANUAL.' I BELIEVE THE PRIMARY CAUSE OF THIS INCIDENT WAS POOR COORD OF CONVERGING TFC BY TWR; AND THE ISSUANCE OF CONFUSING AND AMBIGUOUS INSTRUCTIONS.