TRAINING FLT FAILS TO HOLD SHORT OF RWY.

Narrative

I WAS ON THE GND AT PALWAUKEE ARPT NEAR FBO AVIATION. I HAD A COPLT WITH ME. WE PICKED UP OUR INST CLRNC AND WERE CLRED TO TAXI TO RWY 16 VIA TAXIWAY ALPHA; TO RWY 30R; AND THEN TO BACK TAXI RWY 16. WE WERE TO HOLD SHORT OF RWY 24. I WAS HAVING A PROBLEM WITH MY HEADSET SO MY COPLT READ ME OUR TAXI INSTRUCTIONS. WHEN IT WAS TOO LATE TO STOP BEFORE RWY 24 I SLAMMED THE BRAKES; BUT BEFORE I STOPPED THE CTLR TOLD ME TO KEEP ROLLING AS HE NOTICED THAT WE MAY NOT STOP IN TIME. I WAS NOT TAXIING FAST FOR THE AIRPLANE; BUT SINCE IT IS A HIGH PERFORMANCE TWIN; THE TAXI WAS FASTER THAN IT WOULD HAVE BEEN IN OTHER LIGHT ACFT. BASICALLY; I BELIEVE THE PROBLEM AROSE BECAUSE THE SIGN IDENTING RWY 24 WAS VERY SMALL. IT APPEARED TO BE MUCH SMALLER THAN A LICENSE PLATE. ALSO THE SIGN WAS ONLY AN INCH OR SO OFF THE GND. SINCE I WAS TAXIING ON A RWY; THERE WERE NO HOLDING LINES BEFORE RWY 24 WHERE I WAS TO HOLD SHORT; SO MY ONLY INDICATION OF RWY 24 WAS THE SMALL SIGN. THE ABOVE FACTORS COUPLED WITH THE FACT THAT MANY OF PALWAUKEE'S RWYS (RWY 24 INCLUDED) ARE VERY SKINNY AND MAY BE EASILY MISTAKEN FOR TAXIWAYS; MAKING IT EASY TO MISS HOLDING SHORT OF ONE OF THE RWYS. I BELIEVE A BIGGER SIGN NEAR THE RWY WOULD HAVE DEFINITELY AVERTED THE PROBLEM. I THINK THAT FOR SUCH A BUSY ARPT; LARGER MORE LEGIBLE SIGNS ARE VERY IMPORTANT AND WOULD AVERT FUTURE INCIDENTS AND ACCIDENTS. I BELIEVE THE ACCIDENT BTWN A WDB AND MLG SOME TIME AGO AT DETROIT METRO CLRLY ILLUSTRATES THE IMPORTANT NEED FOR CLR TAXIWAY AND RWY MARKINGS.