Citing recent cases where they say the warning was activated inappropriately, these Amber Alert supporters say it is crucial to limit use to cases where there is strong evidence that a child was kidnapped by a stranger and is likely to be in imminent danger, and where enough is known about the abductor to make a public search effective.
In the crash, the crew lost track of their deteriorating airspeed, and when a warning system activated, Captain Renslow reacted wrongly, pulling up the nose of the Bombardier Dash 8 Q400, instead of pushing it down, to regain airspeed and improve the angle of the wings.
Both types of warning were activated 3.5 s before the hazard object was reached.
Six seconds before impact, the radio altimeter warning was activated.
Click "OK" after reading the Talkback warning to activate this feature.
The Parisian pollution warning service was activated on 11 March.
But the Lopez family's lawyer, Nicholas Scarpelli, focused on whether the accident was caused by a "short signal," a warning light that activated too late.
Most officials did not question the handling of the emergency on Tuesday night -- though some residents were still upset today that no sirens had been activated, warning them of the potential for danger.
Such "associations to red — stop, fire, alarm, warning — can be activated without a person's awareness, and then influence what they are thinking about or doing," said John A. Bargh, a psychology professor at Yale University.
The accident is under investigation by the National Transportation Safety Board, which said that the crossing warning system was activated 20 seconds before the accident and that the guardrail began to come down seven seconds after that.
