Less Than Truckload (LTL) Transportation is delivered with various other shipments and is usually not delivered directly to a destination as full truckloads are. Less-than-truckload shipments are arranged so that the truck driver of the tractor trailer picks up the shipment along a short route and brings back to a terminal, where later transferred to another truck. Less-than-truckload shipments fall between a full truckload shipments and parcel carriers.

The letter bomb detector detects ferrous and non-ferrous metallic objects contained within envelopes or thin packages. Objects are screened from both sides as they are passed under the scanning bar, which is mounted across the top portion of the unit. Mail scanners are suitable for police stations, government buildings, high-security facilities, and large mailrooms. Most mail scanners are quite accurate and can detect suspicious items while preventing false alarms. They use an x-ray to scan the contents of a package and search for dangerous items.