Date: 201812
Local time of day: 1801-2400
Location: ZZZ.Airport, US
Aircraft: PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operator: Personal
Flight plan: IFR
Flight phase: Takeoff / Launch
ATC / advisory: Tower ZZZ
Reporter organization: Government
Reporter function: Supervisor / CIC
Reporter qualification: Air Traffic Control Fully Certified
Human factors: Distraction; Communication Breakdown; Situational Awareness
Second reporter function: Instructor; Ground
Anomaly: ATC Issue All Types; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Detector: Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Issued Advisory / Alert
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: I was on position as a stand-alone CIC during the event. Training was being accomplished on Ground Control. Vehicle X was holding short of Runway XX on W. Ground Control issued instructions to the vehicle to cross Runway XX without coordinating with Local Control. Local Control had just cleared Aircraft X to takeoff on Runway XX. Knowing this; I shouted 'No; no; no!' which can be heard on the tapes; towards the Ground Control Trainee. The Trainee then stopped in the middle of the transmission. Vehicle X began to cross the runway; and then read back the crossing instructions. Aircraft X was on takeoff roll and slightly airborne when Vehicle X crossed in front of it. Vehicle X was clear of the intersection of Runway XX and W before the aircraft reached it.At the time; there was a coyote running around the field; including on active runways. Myself and the Ground Control Trainee were trying to keep an eye on the coyote in order to relay its position to Vehicle X; which is the reason the vehicle came out in the first place. I believe this may have been a contributing distraction to the event.As the CIC; I think that instead of shouting 'No; no; no!' I should have shouted 'Hold short' instead. Perhaps that may have cued the Trainee to say those words instead of just stopping the transmission altogether. Memory aids were used properly at the time; I think this is just a freaky mistake that is a one-time thing. I don't know that anything else could have been done on my part to prevent this incident. The Trainee could possibly learn to scan better (looking at the board to see that Ground Control did not have Runway XX for crossing) and the OJTI [On-the-Job Training Instructor] perhaps could have keyed up over the Trainee and told the vehicle to hold short.


Second narrative: I was acting as an OJTI [On-the-Job Training Instructor] for Ground Control training a developmental. The developmental told Vehicle X to cross Runway XX at taxiway W. Vehicle X immediately started crossing the runway before reading it back as Aircraft X was beginning their takeoff roll on Runway XX. The CIC in the cab alerted us to the departing aircraft; but it was too late to intervene as the vehicle had already crossed in front of the departing aircraft. I did not intervene in time to prevent the runway incursion judging that it would be safer for the vehicle to continue across the runway in fear it may stop in the middle while traffic was departing. In this situation; Vehicle X did not read back the clearance/instructions until after he was across the runway. I recommend that vehicles should either read back the clearance while proceeding or before proceeding to ensure compliance and to allow time for intervention.


Synopsis: Two Local Controllers reported a runway incursion between a departing aircraft and a crossing vehicle.