CAPT OF COMMUTER BECAME CONFUSED AND CROSSED ACTIVE RWY WITHOUT AUTHORIZATION.

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LANDED RWY 4L AND TURNED L ON TAXIWAY ECHO. TWR CLRED US TO 'GOLF' VIA 'BRAVO' AND HOLD SHORT OF RWY 8L. DID NOT SEE TAXIWAY BRAVO; DUE TO FADED TAXI LINE; NO SIGN INDICATING BRAVO TAXIWAY; APPROX 120 DEG L TURN OFF OF 4L; AND DARKNESS. BY THE TIME I REALIZED I HAD MISSED 'BRAVO' I WAS ON 8L. NOTE: HOLD SHORT LINE FOR RWY 8L/26R FADED AND VERY HARD TO SEE AT NIGHT; ALSO SIGN 8L/26R ON R HAND SIDE FADED AND NOT LIGHTED. RWY 8L/26R SIGN ON L SIDE LOCATED APPROX 120 FT TO L OF TAXIWAY ECHO (NOT EASILY NOTICED). NOTICED AIRPLANE LIGHTS AT W END OF RWY 8L APPEARED TO BE IN POS FOR TKOF. CONTINUED ACROSS 8L ON ECHO AND CONTACTED GND. GND CLRED US TO INTER-ISLAND TERMINAL. WHILE TAXIING TO TERMINAL; GND ASKED ME TO CALL TWR. TELEPHONED TWR FROM TERMINAL AND WAS TOLD I HAD CROSSED 8L WITHOUT AUTHORIZATION AND THAT TWR WAS REQUIRED BY THE FAA TO FILL OUT AN INCIDENT RPT. THE RPT WILL GO TO THE LCL FSDO OFFICE. I BELIEVE THIS RWY INCURSION OCCURRED BECAUSE OF THE FOLLOWING REASONS: TAXI LINES AND HOLD LINES FADED AND VERY HARD TO SEE AT NIGHT. I THINK THE TAXI LINES SHOULD BE REPAINTED ON A REGULAR BASIS PREFERABLY WITH A REFLECTIVE PAINT. NO SIGN INDICATING TAXIWAY BRAVO. I BELIEVE A LIGHTED SIGN WITH AN ARROW INDICATING DIRECTION WOULD HELP. FADED; NON- LIGHTED RWY 8L/26R SIGN ON R SIDE OF TAXIWAY ECHO SHOULD BE REPAIRED SO IT WOULD BE MORE VISIBLE. RWY 8L/26R SIGN ON L SIDE OF TAXIWAY ECHO LOCATED APPROX 120 FT L OF TAXIWAY. I THINK THIS SIGN SHOULD BE MOVED CLOSER TO ECHO TAXIWAY.