RPTR CLAIMS A NEAR MISS WITH OPPOSITE DIRECTION TFC AT THE SAME ALT IN NARROW PASS RECENTLY DESIGNATED BY LAS ALLEGEDLY TO KEEP VFR TFC OUT OF THE CLASS B AIRSPACE.

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THE NEW; WKS OLD POLICY OF NOT LETTING VFR TFC INTO THE CLASS B AIRSPACE IS THE CAUSE OF THIS PROB! ACFT DEPARTING AND RETURNING TO VGT FROM THE S AND W ARE FORCED TO GO THROUGH A NARROW PASS UNDER CLASS B BELOW 5000 FT. THE FLOOR OF THIS PASS IS ABOUT 4200-4300 FT. NO ACFT; ESPECIALLY HIGH PERFORMANCE ACFT; SHOULD FLY THAT CLOSE TO THE GND UNLESS THEY ARE LNDG! IN MY CASE; I WAS WORKING ATC WHEN HE CALLED TFC 12 O'CLOCK; SAME ALT; 2 MI AND CLOSING FAST. TOLD ME (NOT SUGGESTED) TO MAKE AN IMMEDIATE R TURN TO 220 DEGS. I ASKED HIM IF HE IS FAMILIAR WITH THE TERRAIN AS THERE IS A 5700 FT MOUNTAIN TO MY R WITH A 4500 FT RIDGE LINE LESS THAN 200 FT AWAY. HE DIDN'T ANSWER THE QUESTION; BUT TOLD ME THE OTHER ACFT WAS 1 MI; 12 O'CLOCK; 4700 FT. I TOLD HIM I WILL TAKE MY CHANCES WITH THE OTHER ACFT AS A R TURN WOULD BE INSTANT DEATH. SUBSEQUENTLY; I SAW THE OTHER ACFT AND TOOK EVASIVE ACTION. THERE WAS A SECOND ACFT BUT PASSED HIM WITH A MUCH WIDER MARGIN. THEY (ATC) HAVE MANUFACTURED A VERY SERIOUS SAFETY PROB HERE UNNECESSARILY AS TFC COUNTS ARE ACTUALLY DOWN AT LAS! YOU CAN'T FUNNEL ACFT INTO A LIMITED AREA AND EXPECT VFR TO FUNCTION PROPERLY. IF THEY DON'T STOP THIS IMMEDIATELY; SOMEONE IS GOING TO GET KILLED EITHER COLLIDING WITH ANOTHER ACFT OR THE TERRAIN. ESPECIALLY SOMEONE FROM SOUTHERN CALIFORNIA; UNFAMILIAR WITH THE AREA AT NIGHT. THERE ARE PLENTY OF VERY GOOD CTLRS AROUND. IT'S A DELIGHT TO WORK SOCAL APCH; ORANGE COUNTY; VAN NUYS; ETC. WE NEED THEM HERE NOW! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT; FROM WHAT HE HAS HEARD; IT APPEARS THAT LAS HAS RESUMED ALLOWING FLTS IN/THROUGH THE CLASS B; INCLUDING CODED RTES FOR ACFT OPS TO/FROM THE GRAND CANYON. RPTR INDICATED THERE HAD BEEN SEVERAL MEETINGS ABOUT THE CLASS B FLT RESTR TO VFR ACFT. RPTR WAS FLYING A C310 WHEN THE NMAC OCCURRED.