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Automatic vehicle location
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=== Sensor-augmented AVL === The main purpose of using AVL is not only to locate the vehicles, but also to obtain information about engine data, fuel consumption, driver data and sensor data from i.e. doors, freezer room on trucks or air pressure. Such data can be obtained via the [[CAN-bus]], via direct connections to AVL systems or via open bus systems such as [[UFDEX]] that both sends and receives data via SMS or [[GPRS]] in pure [[ASCII]] text format. Because most AVL consists of two parts, [[GPS]] and [[GSM]] modem with additional embedded AVL software contained in a [[microcontroller]], most AVL systems are fixed for its purposes unless they connect to an open bus system for expansion possibilities. With an open bus system the users can send invoices based on goods delivered with exact location, time and date data where if connected to scale, [[RFID]] or barcode readers, can make a fairly good automated system to avoid human errors. In countries with high prices on gasoline external fuel sensors are used to prevent cases of fuel theft.<ref>{{cite web|url=http://www.rfidsb.com/tm/2008/04/24/fuel-theft-in-the-usa-reaches-8-billion-in-2008/|title=fuel theft in the usa reaches 8 billion in 2008 β RFID Switchboard|website=www.rfidsb.com|access-date=23 April 2018|archive-url=https://archive.today/20120720214117/http://www.billboard.com/album/madonna/sticky-sweet-tour/1330476%23/album/madonna/sticky-sweet-tour/1330476|archive-date=2012-07-20|url-status=live}}</ref>
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