MD80 FLT CREW ALMOST HAS RWY INCURSION AT SMF.

Narrative

DURING TAXI OUT TO RWY 16R AT SMF; MISSED HARD R TURN FROM TXWY A9 TO PROCEED N ON TXWY A TO RWY 16R. TXWY A9 INTERSECTS RWY 16R AT ABOUT MID-FIELD. I THOUGHT I KNEW MY POS; BUT MISSED OR DISREGARDED RWY HOLD SHORT SIGNS. REALIZED MY MISTAKE WHEN RWY BECAME VISIBLE; AND MADE A HARD STOP APPROX 350-400 FT SHORT OF RWY. GND CTL ASKED US TO CONFIRM WE WERE HOLDING SHORT; WHICH; OF COURSE; WE WERE. ACFT ON FINAL ALLOWED TO LAND ON RWY 16R; AND ROLLED PAST OUR NOSE WELL CLR. WE WERE THEN INSTRUCTED TO BACK-TAXI TO ANOTHER INTXN; THEN CONTINUE TO DEP END RWY 16R. NOTHING IS NEW IN THIS INCIDENT; BUT THE LESSONS HERE ARE PAY ATTN. MY FO WAS BUSY WITH CHKLIST DUTIES AND ANSWERING THE CABIN 'ALL SEATED' CALL FROM THE FIRST FLT ATTENDANT. OTHER FACTORS INCLUDED CONFLICTING TXWY TFC; LATE PUSH BACK; POSSIBLE JET FUEL ODORS IN CABIN (THEY CLRED AFTER ENG START); AND A CALL FROM THE CABIN CREW DURING PUSH BACK FOR FLT TIME INFO. NO MATTER; BOTH HEADS SHOULD BE OUTSIDE DURING A CRITICAL OR UNFAMILIAR TAXI RTE.