What was the blue light seen on Aston Martin's new F1 car during testing?

Aston Martin's 2026 car made its track debut during the five-day F1 pre-season test in Barcelona. A blue flashing light was spotted at the rear of the car during the run. The light was reportedly used to alert other teams and drivers that the car was running at a slower pace, ensuring it was easily identifiable and helping avoid accidents.