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Alerts watch a crossing, lane, and threshold so you do not have to keep refreshing.
Pick a crossing, channel, lane, and wait threshold.
Email alerts can start first; SMS and WhatsApp can follow after extra verification.
Alerts should pause when updates are delayed so travelers do not act on old information.
STOP and opt-out flows protect users who no longer want messages.
Quick answer: Alerts watch a crossing, lane, and threshold so you do not have to keep refreshing. Always confirm the current wait page and update time before changing route.