PLT OF AN SMA SEL TRAINING ACFT FAILED TO HOLD SHORT OF A RWY INTXN AFTER LNDG RESULTING IN A CONFLICT WITH ANOTHER ACFT TKOF ON INTERSECTING RWY AT CMI.

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CHAMPAIGN APCH STATED THAT I WAS ON A BASE FOR RWY 14R AND I SHOULD CONTACT THE TWR; SO I CONTACTED THE TWR. CHAMPAIGN TWR SAID; 'SMA SEL X CLRED TO LAND ON RWY 14R HOLD SHORT OF RWY 4L.' I READ THE CLRNC BACK AND WROTE IT DOWN. I INTERPRETED THE CLRNC TO MEAN I WAS TO HOLD SHORT OF RWY 4L ONCE I HAD EXITED RWY 14R; NOT ON MY ROLLOUT AFTER LNDG. I DID NOT HAVE ANY TIME TO LOOK AGAIN AT THE ARPT DIAGRAM BECAUSE I WAS ABOUT TO TURN FINAL APCH FOR RWY 14R. I DID TURN FINAL AND REALIZED THAT APCH SET ME UP FOR A BASE FOR RWY 18 WHICH IS MORE OF A DOWNWIND FOR RWY 14R; SO I CORRECTED ACCORDINGLY; WONDERING WHY APCH COULD PUT ME IN A SIT WHERE I COULD LAND ON THE WRONG RWY. THEN I TURNED BASE TO A FINAL APCH FOR RWY 14R AND LANDED JUST PAST THE THRESHOLD AND SLOWED MY PLANE DOWN. I WAS LOOKING FOR A TXWY TO EXIT; HOWEVER; THERE WAS NONE; SO I ASKED CHAMPAIGN TWR FOR PROGRESSIVE INSTRUCTIONS. CHAMPAIGN TWR DID NOT RESPOND TO MY REQUEST FOR APPROX 10 SECONDS; THEN I HEARD 'STOP.' AT THIS POINT I WAS ON RWY 14R AT RWY 4L. IF I WOULD HAVE STOPPED I WOULD HAVE STOPPED ON RWY 14R WHILE BEING ON RWY 4L; SO I STOPPED JUST AFTER RWY 4L BECAUSE I SAW WHAT LOOKED LIKE AN SMA SEL Y TAKING OFF. I DIDN'T SEE ANY HOLD SHORT MARKINGS OR RWY SIGNS; ALL OF WHICH I WAS LOOKING FOR. I FEEL THAT IF THE TWR WOULD HAVE STATED CLRED TO LAND ON RWY 14R AND HOLD SHORT OF RWY 4L WHILE STILL ON RWY 14R; THAT WOULD HAVE CLRED IT UP. ADDITIONALLY; IF THE TWR WOULD HAVE RESPONDED TO MY REQUEST FOR FURTHER INSTRUCTIONS SOONER; THEN THERE WOULD HAVE BEEN ENOUGH TIME TO STOP AND HOLD SHORT OF RWY 4L. TO PREVENT A RECURRENCE OF THIS SIT; I FEEL THAT THE TWR SHOULD ADVISE PLTS TO COME TO A COMPLETE STOP IMMEDIATELY AFTER LNDG OR THE CTLR SHOULD VERIFY THAT THERE WILL NOT BE ANY CONFLICTS AMONG SIMULTANEOUS OPS OF INTERSECTING RWYS BEFORE CLRING OTHER ACFT FOR TKOF.