Airbus A321 231 incident near Fort Lauderdale, Florida, January 29, 2016

The NTSB's narrative final · quoted from the NTSB record

The runway incursion occurred during the early morning hours when traffic was light, and when the airport authority usually conducted maintenance activities on the airfield. The air traffic controller approved a request by an airport maintenance vehicle to operate on the runway; however,  there were no standard operating procedures or standard phraseology regarding how airfield vehicle operators were to reference the specific runway end when requesting permission to enter a runway. This lack of standard procedure resulted in four hear back/read back errors between the operator of the vehicle and the air traffic controller immediately prior to the runway incursion event. After the airport vehicle had been approved by the air traffic controller to operate on the runway, the crew of the A321 requested a clearance to taxi to the same runway for departure and was subsequently cleared for takeoff. The airport runways and taxiways were equipped with the Runway Status Light (RWSL) system. As the crew of the A321 aligned with the runway centerline for departure, the Takeoff Hold Lights (THL) portion of the RWSL activated, displaying red lights on the runway surface. The crew continued the takeoff over the illuminated RWSL system. The RWSL system was operating correctly and the THL portion of the system deactivated when the A321 reached a predetermined speed consistent with an aircraft continuing departure. As the A321 was departing, the Airport Surface Detection Equipment Model X (ASDE-X) alerted and the air traffic controller responded by cancelling the takeoff clearance when the A321 was near takeoff speed. The A321 stopped on the runway about 500 feet from the airport vehicle.

The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.