FLC OF AN MLG ACR ACFT QUESTION THE APPROPRIATENESS AND THE SAFETY OF TWR REQUESTING FROM THE FLC THE TURNOFF POINT FROM THE RWY AFTER LNDG.

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ON 3 SEPARATE DATES IN OCT; I HAVE NOTICED THE SAME PRACTICE FROM DCA TWR. JUST AS OUR ACFT IS TOUCHING DOWN DURING LNDG ROLLOUT; THE TWR CTLR CALLS ON THE RADIO ASKING WHERE WE EXPECT TO STOP AND TURN OFF THE RWY. ALL 3 DATES I LANDED ON RWY 18/36. TWICE WE IGNORED THE INITIAL CALL; AND THEN HAD TWR COME BACK WITH 'ACKNOWLEDGE PLEASE' IN AN ANXIOUS/DEMANDING TONE. THIS IS A CRITICAL PHASE OF FLT ONTO A SHORT; BUSY; AND FAA SPECIAL ARPT. TO BE CALLED DURING LNDG ROLLOUT IS VERY; VERY DISTRACTING. MY FIRST PRIORITY IS THE SAFE OP (STOPPING) OF THE ACFT; NOT A RADIO CALL. SECONDLY; IN THE EARLY SECONDS OF A LNDG ROLLOUT; I CAN'T PREDICT WITH CERTAINTY WHICH TXWY OR XING RWY I WILL BE ABLE TO SAFELY STOP BY. 2 DANGERS EXIST. PLTS MIGHT GIVE AN INCORRECT EXIT RESPONSE AND THEREBY CAUSE AN INCIDENT; OR THE DISTR OF THE RADIO CALL MAY CAUSE AN ACFT TO RUN OFF THE END OF THE RWY. I RECOMMEND DCA TWR STOP THIS PRACTICE ALTOGETHER OR ADVISE AN INCOMING PLANE; AT LEAST A MIN OR 2 BEFORE LNDG; TO CALL THE TWR WHEN THEY ARE AT A SAFE TAXI SPD. LNDG ROLLOUT IS NO TIME TO BE LOOKING FOR A PARTICULAR TXWY; TALKING ON THE RADIO; OR WORSE YET -- GLANCING DOWN AT YOUR ARPT DIAGRAM.