Regional Jet 200 ER/LR (CRJ200)
Situational Awareness; Communication Breakdown
Conflict Ground Conflict; Critical; Ground Incursion Runway
Flight Crew Rejected Takeoff
Human Factors
Origination and taxi out were standard. Tower cleared us for takeoff. I advanced the thrust and called 'set power.' Shortly thereafter I observed another carrier CRJ quickly approaching the runway on the taxiway. I pulled the thrust to idle; called for an abort and transferred the controls to the Captain. We exited the runway and brought the aircraft to a safe stop on the taxiway. We conducted the Aborted Takeoff Checklist; reviewed the brake cooling procedure and returned for a departure after 15 minutes. The remainder of the flight was conducted standard. Abort was conducted as soon as it was obvious that the CRJ was taxiing onto the runway.
A CRJ-200 First Officer initiated a rejected takeoff when he noted another CRJ encroaching on their runway at high speed.