Pick the one that sounds like you. Each takes a couple of minutes to start.



A tracker rides inside the sign's frame and a small Bluetooth beacon is sealed into the sign itself. The tracker hears the beacon every minute. If the sign comes off, the beacon goes quiet and those minutes don't count, for the advertiser or the driver.
Traffic volumes come from Caltrans counts, or a published default for the road's class where the state doesn't count. The share of traffic behind the truck, the daylight weighting and people per car are stated assumptions — the same ones on every report, so anyone can redo the sum.
Every campaign report ends with the method and the inputs used for that campaign.