ACR WDB WAS ISSUED THE MEAD 1 PGS SID. PRIOR TO TKOF; THE LCL CTLR ASSIGNED 060 DEG HDG VECTOR FOR TFC. DEP CTLR TOLD FLC TO DISREGARD THE RESTR; CLB AND MAINTAIN 17000 FT. FLC STARTED TURN TO BLD. DEP CTLR QUESTIONS HDG AND REISSUES THE 060 DEG HDG POINTING OUT ARR TFC INBOUND. FLC QUESTIONS USE OF THE SID WHEN VECTORS ARE USED AND THE USE OF NONSTANDARD LANGUAGE BY THE DEP CTLR PERTAINING TO THE RESTR. LTSS.

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PRIOR TO TAXI; CLRNC ISSUED WAS 'CLRED TO DFW; MEAD 1 DEP; PEACH SPRINGS TRANSITION; MAINTAIN 7000 FT; EXPECT 17000 FT IN 2 MINS; DEP 133.95; SQUAWK XXXX.' PRIOR TO DEP THE TWR SAYS 'AFTER DEP; FOR TFC; FLY HDG 060 DEGS.' WE WERE THEN CLRED FOR TKOF ON RWY 1R AT LAS. AFTER DEP WE FLEW HDG 060 DEGS. AFTER CONTACTING DEP CTL; DEP CTLR SAYS 'DISREGARD THE RESTR; CLB AND MAINTAIN 17000 FT.' THE CAPT ACKNOWLEDGED AND THEN AS WE PASSED THROUGH 4000 FT; THE CAPT TURNED MY HDG BUG TO ABOUT 105 DEGS OR SO AND TELLS ME TO GO DIRECT TO BLD VOR. AS I MADE THAT TURN I REMEMBER THINKING THAT I HAD NOT HEARD DEP SAY RESUME THE MEAD 1 DEP; BUT I DID HEAR 'DISREGARD THE RESTR' WHICH SEEMED TO BE A REF BACK TO THE MEAD 1 DEP. AS I ROLLED OUT ON A DIRECT HDG TO BLD VOR; I WAS ABOUT TO ASK FOR A CLARIFICATION FROM MY CAPT WHEN DEP CTL ASKED WHAT OUR HDG WAS. WE SAID IT WAS 110 DEGS AND DEP CTL SAYS; 'TURN IMMEDIATELY TO 060 DEGS; YOU HAVE TFC AT 10 O'CLOCK; SAME ALT.' I MADE THE TURN BACK TO 060 DEGS WHILE WE HAD OUR TFC IN SIGHT ABOUT 1 MI AWAY AND DSNDING THROUGH OUR ALT. I BELIEVE THE PROB AROSE BECAUSE OF SEVERAL REASONS. THE MEAD 1 DEP SHOULD NEVER BE USED WHEN TFC IS LNDG ON RWY 25 (AS OUR CONFLICTING TFC WAS). IT WILL CREATE A TFC CONFLICT WITH RWY 25 ARRS. WHEN WE ASKED THE ATC SUPVR DURING A PHONE CONVERSATION AFTER COMPLETION OF THE FLT WHY THEY USE THE MEAD 1 IN THIS SIT HE STATED; 'WE HAVE NO OTHER WAY TO GET YOU ONTO THE TRANSITION;' SO THEY ISSUE A PROC THAT THEY KNOW WON'T WORK AND RELY ON A LATER MODIFICATION TO PREVENT TFC CONFLICTS. A LOSS OF COM IN THIS SIT MAY HAVE RESULTED IN A MIDAIR COLLISION. THIS PROC NEEDS CHANGING. A SIMPLE 'FLY 060 DEGS; RADAR VECTORS TO BLD VOR WOULD WORK. ANOTHER CONTRIBUTING FACTOR WAS DEP CTL'S USE OF NONSTANDARD LANGUAGE. HE STATED 'DISREGARD THE RESTR; CLB AND MAINTAIN 17000 FT.' WHAT RESTR DOES THIS REFER TO? THE FIRST THOUGHT I HAD AFTER HEARING THIS WAS THE ALT RESTRS ASSOCIATED WITH THE MEAD 1 DEP. THIS THOUGHT LED ME TO BELIEVE THAT I HAD NOT HEARD OR HAD MISSED THE CTLR RECLRING US BACK ONTO THE MEAD 1 DEP. THIS THOUGHT SEEMINGLY WAS CONFIRMED WHEN THE CAPT INSTRUCTED ME TO GO DIRECT TO BLD VOR; AND THUS RESUME THE MEAD 1. 'DISREGARD THE RESTRS' IS NOT TERMINOLOGY NORMALLY ASSOCIATED WITH A NEW ALT ASSIGNMENT UNLESS YOU WERE PREVIOUSLY GIVEN A XING RESTR. IT IS PERHAPS SIGNIFICANT THAT THE FACILITY SUPVR ADMITTED THAT ANOTHER AIRLINE CREW; LESS THAN AN HR AFTER US; COMMITTED THE SAME ERROR. HE ALSO STATED THAT THIS SAME EVENT HAS OCCURRED SEVERAL TIMES IN THE PAST. THIS HIGHLIGHTS THE FACT THAT THE USE OF THE MEAD 1 DEP FOR TFC DEPARTING RWY 1R WHILE TFC IS LNDG ON RWY 25L OR RWY 25R IS NOT A SAFE PROC. CALLBACK CONVERSATION WITH THE FACILITY REVEALED THE FOLLOWING INFO: CALL TO THE FACILITY REVEALED THE REASON FOR THE 060 DEG HDG IS THE STRONG NW WINDS. USING THE 070 DEG HDG ON THE MEAD 1 SID; THE ACFT ARE BLOWN TOWARD THE LOC FOR RWY 25 APCHS. THE FACILITY IS AWARE OF THE PROB AND HOPES TO HAVE IT REMEDIED IN 60 DAYS BY CHANGING THE INITIAL HDG FROM 070 DEGS TO 060 DEGS.