Traffic frequency is enforced per visitor and per campaign.
Hourly Unique
The same visitor may qualify for the same campaign again after a rolling 60-minute cooldown from the last qualified view.
Daily Unique
The same visitor may qualify for the same campaign again after a rolling 24-hour cooldown.
Campaign Unique
The visitor can qualify only once for that campaign for its lifetime.
A visitor may still qualify for different eligible campaigns during the same session because frequency is campaign-specific.