SR20 INSTRUCTOR AND STUDENT ARE REQUIRED TO ABORT TKOF DUE TO A RWY INCURSION.

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TXWY A IS UNDER CONSTRUCTION; LEAVING A TAXI AREA OF UNDER 37 FT AVAILABLE BTWN INTXNS R AND Q. GND CTL OFFERS AN INTXN DEP AT TXWY Q RIGHT BEFORE THE CONSTRUCTION ZONE WHEN DEPARTING RWY 34. THIS REDUCES THE RWY BY 2000 FT. THE RENAMING OF THE INTXNS OCCURRED RECENTLY AND GOVT/COMMERCIAL CHART COMPANY HAVEN'T UPDATED THEIR ARPT DIAGRAMS YET; SO THERE IS CONSTANT CONFUSION ON THE PARTS OF THE CTLRS AND PLTS AS TO LOCATION AND TAXIING INSTRUCTIONS. CLRED TO POS AND HOLD; WE TURNED THE LIGHTS ON; CHKED THE FINALS AND POS; GIVING UP VERY LITTLE RWY. CLRED FOR TKOF; THE CLIENT ADDS FULL PWR. I SAW A CHEROKEE PULLING OUT ONTO THE RWY AHEAD OF US. I SAID 'WHOA; ABORT; ABORT' AS MY HAND TOUCHED THE THROTTLE AND OUR TCAS ANNOUNCED 'TFC; TFC!' THE CLIENT HAD ALREADY INITIATED IDLE PWR AND BRAKING; SO I DIDN'T INTERFERE. THERE WAS A MOMENT OF SILENCE ON THE FREQ BEFORE TWR REALIZED WHAT WAS GOING ON AND ISSUED INSTRUCTIONS TO THE CHEROKEE TO STOP THEN US. WE'D ALREADY STOPPED BY THE TIME THE TWR CANCELED OUR TKOF CLRNC.