RPTR ALLEGES THERE IS CONFUSION WITH RWYS 28L-23 CONFIGN SIGNAGE CITING A BE36 WHO WAS GIVEN POS AND HOLD ON RWY 28L BUT WENT INTO POS ON RWY 23.

Narrative

I WAS WORKING GND AND LCL CTL COMBINED THIS SATURDAY AFTERNOON. A BE36 WAS ISSUED A TAXI CLRNC TO RWY 28L; WITH INSTRUCTIONS TO HOLD SHORT OF RWY 23 (THE HOLD SHORT INSTRUCTIONS ARE NOW REQUIRED TO BE ISSUED FOR EACH AND EVERY TAXI CLRNC TO RWY 28L VIA TXWY D; DUE TO CONTINUED PLT CONFUSION IN THIS AREA). THE PLT DID AS INSTRUCTED; AND HELD SHORT OF THE COMBINED HOLD SHORT LINE FOR RWYS 23 AND 28L. THE BONANZA THEN CALLED READY FOR DEP ON RWY 28L. I HAD A 4 MI GAP; SO AFTER THE FIRST ARR PASSED; I INSTRUCTED THE BONANZA TO TAXI INTO POS AND HOLD ON RWY 28L. THE PLT READ BACK THE CLRNC VERBATIM. IT WAS GOING TO BE A LITTLE TIGHT TO GET THE BONANZA OUT; BUT NOT ANYTHING OUT OF THE ORDINARY. HOWEVER; ONCE I GOT THE FIRST ARR OFF THE RWY AND WAS ABOUT TO ISSUE THE TKOF CLRNC TO THE BONANZA; I DISCOVERED THAT THE PLT HAD TAXIED INTO POS AND WAS HOLDING ON RWY 23. I HAD TO EXPLAIN TO THE PLT THAT HE HAD LINED UP ON THE INCORRECT RWY; AND THAT HE NEEDED TO TAXI VIA RWY 23 TO GET TO RWY 28L. I URGED HIM TO HURRY; AND I CLRED HIM FOR TKOF. THE PLT COMPLIED; AND APOLOGIZED FOR HIS MISTAKE. I BARELY HAD MINIMUM SEPARATION WITH THE SECOND ARR. THIS TXWY D/RWY 23/RWY 28L AREA HAS CAUSED CONFUSION FOR MANY A PLT. THERE HAS BEEN A LOT OF DISCUSSION ABOUT THIS PROB; MOSTLY RESULTING IN RESPONSES STATING THAT ALL SIGNAGE/MARKING MEETS MINIMUM FAA STANDARDS. IF THIS IS THE CASE; THEN POSSIBLY THE STANDARDS ARE FLAWED; AS THIS TYPE OF MISTAKE OCCURS; EVEN WITH PROFESSIONAL PLTS.