RWY INCURSION BY AN OUT OF TOWN CREW.

Narrative

I WAS PUSHED BACK FROM GATE AT SFO. THERE WAS A LARGE AREA OF CONSTRUCTION BTWN THE ACR X GATES AND THE ACR A GATES BEHIND ME. I WAS NOT PUSHED BACK TO THE NORMAL RAMP TAXI OUT LINES BUT JUST BACK FAR ENOUGH SO I COULD TAXI. THE FLT AT THE GATE TO MY L NEEDED TO BE PUSHED AT THE SAME TIME AND WAS PUT IN THE ALLEY BEHIND ME. MY ACFT THEN WAS FACED JUST N OF A W HDG WITH THE CONSTRUCTION SITE BEING N OF ME. GND CTL HAD INSTRUCTED US TO PUSH SHORT OF THE INNER TXWY. OUT OF MY FRONT WINDOW; SLIGHTLY TO THE R WAS A BIG SIGN ILLUMINATED BY A VERY BRIGHT LIGHT. THERE WAS A GUARD THERE HOLDING A FLAG. THE SIGN SAID THAT NO VEHICLES WERE ALLOWED PAST THAT POINT WITHOUT AN ESCORT. THIS CAUSED MY PROB. GND CTL SAID; 'TAXI KILO; OUTER; TO RWY 1R.' I ASKED WHERE KILO WAS. MY INTERP OF HIS ANSWER WAS THAT KILO WAS AT THIS END OF THE CONSTRUCTION SITE. IT WAS MY PERCEPTION THAT THE GUARD WAS AT THE VEHICLE ROAD BEFORE THE INNER TXWY. ACTUALLY; I REALIZE NOW; HE WAS JUST BEFORE THE OUTER TXWY. FOR ME TO TAXI BY THE GUARD; I TAXIED STRAIGHT IN THE DIRECTION IN WHICH I WAS PUSHED. I COULD NOT TURN THE ACFT FROM THAT HDG UNTIL MY WING WAS EVEN WITH THE GUARD AND THE BRIGHT LIGHT. WHEN I STRAIGHTENED THE ACFT ON KILO TXWY; I PUT THE NOSEWHEEL ON THE YELLOW LINE. I PERCEIVED THE GUARD TO BE ON THE RAMP SIDE OF THE INNER; GUARDING THE VEHICLE ROAD. ALSO; AT THAT TIME; AN ACFT TURNED OFF THE RWY AT KILO AND STOPPED. I THOUGHT HE WAS HOLDING SHORT OF THE OUTER SO THAT HE COULD TAXI INTO ACR C ONCE I PASSED HIM. MY ATTN WAS THEN DIVERTED TO MY ENG PWR. I HAD TO MAKE SURE THAT I DID NOT ADVANCE MY THROTTLES TOO FAR SO THAT I WOULD NOT CAUSE DAMAGE OR INJURY TO THE CONSTRUCTION SITE BEHIND ME. I LOOKED UP AND SAW THE YELLOW TAXI LINE TURNING R AND FOLLOWED IT. I WAS JUST BARELY ON THE RWY WHEN I REALIZED WHERE I WAS AND STOPPED. I IMMEDIATELY TOLD GND CTL. I WAS THEN CLRED UP THE RWY AND ON TO THE OUTER. THERE WERE SOME THINGS THAT CONTRIBUTED TO THIS SIT BESIDES MY PERCEPTION OF WHERE I WAS. MY COPLT WAS FLYING HIS FIRST LINE TRIP SINCE BEING IN SCHOOL. HE WAS MOSTLY OCCUPIED MAKING SURE THAT HE WAS DOING HIS SOP'S CORRECTLY. THE CONSTRUCTION SITE WAS ILLUMINATED BY VERY BRIGHT LIGHTS MAKING THE PERIMETER AREA EXTREMELY DARK AND INDEFINABLE. THERE WERE NO ILLUMINATED TXWY SIGNS OR ILLUMINATED RWY SIGNS. THERE WERE NO TEMPORARY TXWY LIGHTS THAT I COULD SEE. I DID NOT HAVE A TEMPORARY ARPT PAGE SHOWING THE CONSTRUCTION SITE. THE CTLR ASSUMED THAT I KNEW WHERE THE OUTER TXWY WAS IN RELATION TO THE CONSTRUCTION SITE BECAUSE HE WAS THERE EVERY DAY.