MDT DEP FROM CMH RECEIVED INSTRUCTIONS FOR TKOF; OBSERVED VEHICLE ON/NEAR THE RWY; ATC THEN CANCELED TKOF CLRNC.

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WE CALLED CMH GND CTL TO TAXI. PRIOR TO CALLING; BOTH PF AND PNF REVIEWED THE ARPT DIAGRAM AND DISCUSSED WHAT OUR MOST PROBABLE TAXI RTE WOULD BE. THE ATIS BROADCASTED RWY 28R AND RWY 28L IN USE. WE BOTH AGREED THAT WE WOULD MOST LIKELY GET RWY 28L BECAUSE WE WERE AT THE FBO ON THE S SIDE OF THE ARPT. WHEN WE CALLED FOR TAXI WE BOTH AGREED THAT WE HEARD TAXI TO RWY 28L AND TAXIED C2 TO TXWY C THEN WENT E OR TXWY C. ONCE WE ARRIVED AT TXWY F; I THOUGHT THAT WE WERE FULL LENGTH AND HAD THE PF CALL READY. HE CALLED AND SAID 'WE WERE HOLDING SHORT OF RWY 28L READY FOR DEP.' TWR SAID 'RWY 28L CLR FOR TKOF; FLY RWY HDG.' THE PNF READ BACK THE INSTRUCTION AND AS WE TAXIED ONTO THE RWY; I BEGAN TO SEE THAT SOMETHING DIDN'T SEEM RIGHT. I SAW AN ARPT VEHICLE OFF MY L (SNOW REMOVAL; I THINK) AND AT THE FAR END WE COULD SEE EQUIP ON THE RWY. JUST AS WE WERE GETTING READY TO CALL AND ASK TWR; HE TRANSMITTED TO US TO CANCEL TKOF CLRNC. ONCE WE EXITED THE RWY AT C1; TWR STATED THAT WE WERE SUPPOSED TO BE RWY 28R. WE THEN TAXIED TO RWY 28R WITHOUT FURTHER INCIDENT; DEPARTED RWY 28R.