event trigger

Key Takeaways

• A trigger flags and protects a recording segment — but only if the trigger fired. Incidents that don't meet the threshold may not be automatically preserved.
• Different systems use different trigger thresholds. A hard braking event on one platform may not trigger the same response on another with a different configuration.
• When an incident occurs, confirm whether a trigger fired before assuming the footage is safe from overwrite.

Plain-English meaning

An event trigger is a system signal that starts or marks a recording segment for retention. Common triggers include hard braking above a configured G-force threshold, impact detection, lane departure, steering severity, speed threshold crossing, or manual driver activation.

When a trigger fires, the recording around that moment — typically a short window before and after — is flagged and protected from the routine overwrite cycle. Events that don't reach the trigger threshold may not be protected.

In evidence preservation

Understanding trigger behavior is part of using dash cam evidence correctly. A preserved clip means the system detected something specific. An unpreserved clip may mean the system didn't detect a trigger — or that footage was overwritten before preservation was initiated.

When reviewing event clips for coaching or incident analysis, note the trigger type, the timestamp, and any associated telematics data. The trigger type provides context for why the clip was captured.