VFR MOONEY M20 PLT IS TAKEN TO TASK FOR USING THE VFR FLYWAY NEAR DCA WHEN NOT ON RADAR ADVISORIES FROM APCH CTLR AT IAD; VA.

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DEPARTING HEF ENRTE TO LNS; I ATTEMPTED TO RECEIVE VFR RADAR ADVISORIES; FOLLOWING THE EXACT RTE THAT I HAD FLOWN 30 MINS EARLIER VFR WITH RADAR ADVISORIES FROM LNS TO HEF. THIS RTE WAS WITHIN A CHARTED 'VFR CORRIDOR;' FROM THE SURFACE TO 3000 FT MSL; BENEATH THE WASHINGTON CLASS B AIRSPACE. HEF TWR APPROVED AN EBOUND TURN UPON DEP AND A FREQ CHANGE TO DULLES APCH. UPON CONTACT WITH DULLES APCH; I WAS REFUSED RADAR SVC AND ADVISED TO REMAIN CLR OF THE WASHINGTON CLASS B AIRSPACE. UPON ENTERING THE VFR CORRIDOR; I NAVED NBOUND AS FAR W AS IS POSSIBLE WITHIN THE CORRIDOR. UPON LNDG AT LNS; I WAS INFORMED THE VFR CORRIDOR IS NO LONGER USED BECAUSE A PORTION OF IT FALLS WITHIN THE WASHINGTON TFR. DUE TO THE FACT THAT ON NUMEROUS OCCASIONS I HAVE BEEN VECTORED WHILE VFR BY APCH (INCLUDING THAT SAME DAY) INTO THIS VFR CORRIDOR; I ASSUMED THAT THERE WAS A CUTOUT TO ALLOW FOR VFR TFC BENEATH THE CLASS B. APPARENTLY; VFR FLTS ARE ALLOWED INTO THIS AIRSPACE ONLY WHILE RECEIVING RADAR ADVISORIES. THIS IS NOT PUBLISHED. IF THIS AIRSPACE IS VITAL TO NATIONAL SECURITY; THEN ALL VFR SHOULD BE KEPT OUT; WHETHER OR NOT RADAR ADVISORIES ARE BEING UTILIZED. OTHERWISE; CONFUSION AND VIOLATIONS ARE BOUND TO OCCUR.