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Video of the fatal LaGuardia runway collision appears to show the autonomous runway status lights illuminated red as the fire truck entered the runway — a warning system designed to tell vehicles and aircraft not to proceed even if they have a clearance. That does not settle blame, and the investigation will still have to sort out what air traffic control, the truck crew, and airport procedures each contributed, but it adds a critical detail to a crash that already killed the two pilots of the arriving Air Canada Express jet.