PHRASEOLOGY OF A TAXI CLRNC COULD LEAD AN UNWARY FLC TO TAXI OFF THE RWY ONTO AN UNPAVED AREA.

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WHILE HOLDING SHORT OF RWY 20R ON B5; TWR INFORMED US THAT THEY NEEDED TO RESEQUENCE US AND INSTRUCTED US TO CROSS 20R AND HOLD SHORT OF 20R ON A6. (ACTUALLY; CLRNC WAS TO CROSS 20R; MAKE THE L AND HOLD SHORT OF 20R ON THE NEXT TXWY TO THE L.) ONCE STOPPED; BNA TWR THEN CLRED US TO 'CROSS 20R AND RPT CLR.' JUST PRIOR TO THIS INCIDENT; THE CAPT WAS TALKING ABOUT A VERY SIMILAR EARLIER SIT WHERE THE CREW ALMOST TAXIED OFF THE EDGE OF THE RWY. T2 IS DIRECTLY ACROSS FROM A6. UNLESS YOU ARE FAMILIAR WITH THE FACT T2 DOES NOT INTERSECT WITH THE RWY DUE TO THE CROWN IN THE RWY; AND THE VISIBLE SECTION OF T2 AT NIGHT IS NOT VISIBLE UNTIL YOUR ACFT CLRS THE CROWN OF THE RWY THUS ALLOWING YOUR LIGHTS TO ILLUMINATE THE E EDGE OF THE RWY; IT APPEARS THAT T2 MIGHT INTERSECT WITH THE RWY. AS WE ENTERED THE RWY; WE QUESTIONED THE TWR ON WHAT THEY WANTED SINCE WE COULD NOT 'TAXI ACROSS.' THEY INSTRUCTED US TO TURN R AND GET OFF AT THE NEXT TXWY AND TO EXPEDITE. EVENTUALLY TWR ISSUED A GAR TO LNDG TFC. I BELIEVE TWR'S CLRNC TO CROSS 20R AT A6 COULD SUCKER A CREW INTO EXITING THE RWY AT OTHER THAN A TXWY. IT ALSO SOUNDS LIKE THIS CLRNC HAS BEEN GIVEN MORE THAN ONCE!