A C410 PLT; TAXIING FOR TKOF AT SLC; TAXIED ACROSS HIS ASSIGNED RWY WITHOUT A CLRNC.

Narrative

IT WAS EARLY TUESDAY MORNING APPROX XA30. THE REGULAR RWY 35 HAS BEEN CLOSED FOR SVCING. I WAS GIVEN A DIFFERENT TAXI INSTRUCTION; BUT WAS FAIRLY FAMILIAR WITH ARPT TO KNOW WHAT ATC WANTED. I WAS CLRED TO TAXI TO AND HOLD SHORT OF RWY 32. THE ARPT IS LAID OUT SO RWY 32 AND RWY 35 INTERSECT EACH OTHER AT 30 DEGS AT THE THRESHOLDS. MY PERCEPTION OF THE ARPT LAYOUT WAS THAT THEY WERE 2 SEPARATE RWYS. I TAXIED ACROSS RWY 35 TO HOLD SHORT OF RWY 32; BUT UNKNOWINGLY TAXIED ACROSS RWY 32. I HAD SEEN THE RED SIGNS INDICATING THE RWYS 32 AND 35; BUT THEY DID NOT REGISTER TO ME. LUCKILY; NO ACFT WERE ON FINAL AND NO ONE WAS ENDANGERED. HOWEVER; I HAD FAILED TO STOP AND HOLD SHORT AT THE INTXN. THE CONTRIBUTING FACTORS THAT I BELIEVED THAT PLAYED A ROLE IN THIS SIT WERE FATIGUE; LACK OF PROPER PREFLT PLANNING (I HAD THE TAXI LAYOUT OF THE ARPT IN THE FLT BAG BUT DID NOT STUDY IT); AND FAILURE TO COMPREHEND THE RED RWY SIGNS POSTED. THIS EVENT HAS TAUGHT ME THERE IS NO SUBSTITUTE FOR PROPER PREFLT PLANNING AND BEING AT 1000/0 ATTENTIVE TO THE FLT.