Freight scanning tunnels also offer an excellent opportunity for further collection of package data. By adding in-motion scales, the latest generation of scanning tunnels can simultaneously collect a package's unique bar code identifier, the actual package dimensions, and the weight of a package at high speed without manual intervention. Since package handlers charge for their service by package size and weight, this information is essential to revenue flow, and can now be captured accurately and efficiently at the speeds required in order to meet the demands of the customer.