--- title: "Automatic vehicle location" chunk: 1/2 source: "https://en.wikipedia.org/wiki/Automatic_vehicle_location" category: "reference" tags: "science, encyclopedia" date_saved: "2026-05-05T12:51:24.823671+00:00" instance: "kb-cron" --- Automatic vehicle location (AVL) is a method for automatically determining and transmitting the geographic location of a vehicle. This data can be used to create a vehicle tracking system, which is a component of fleet telematics and various location-based services in the Internet of Things (IoT) ecosystem. The most common method for determining location is through the use of a GNSS receiver (such as GPS), which collects positioning data from satellites. This data is then transmitted via a wireless network, typically a cellular network or satellite communication system, to a central server. The server processes this information and makes it available for several applications, from dispatching emergency vehicles to providing real-time arrival information for public transport. AVL is often integrated with other vehicle systems to collect a wider range of data as part of telematics. == How AVL works == An Automatic vehicle location system (AVLS) typically functions in three stages: position determination, data transmission, and data integration. === Positioning (determining location) === First, a device in the vehicle, typically a GPS tracking unit, determines its geographic coordinates. Most systems use a GNSS (Global Navigation Satellite System) receiver. The receivers calculate their position by processing signals from satellite constellations, such as the United States' GPS, Russia's GLONASS, or Europe's Galileo. In urban environments where satellite signals may be obstructed by buildings, this positioning data can be supplemented with other methods like cellular triangulation or Wi-Fi positioning to maintain a location fix. === Data transmission (communicating location) === Second, the AVL device, often a telematic control unit, transmits this telemetry data to a central server. The two primary methods of transmission are: Cellular This is the most common and cost-effective method, utilizing GPRS, LTE, or 5G networks to send data. It is suitable for vehicles operating within areas of reliable cellular coverage. Satellite For vehicles that operate in remote locations without cellular service (such as in long-haul trucking, mining, or maritime operations), data is transmitted via a satellite network. This method is more expensive but provides global connectivity. === Data integration (using the location) === Third, a backend server receives and processes the vehicle location data. This server stores the information and makes it available to software applications through an API (Application Programming Interface). The data is analyzed to support management decisions. This allows a fleet management platform to display a vehicle's position on a map or a public transport application to provide passengers with real-time arrival predictions. == Applications == Automatic vehicle location has several applications across commercial, public, and consumer sectors. === Fleet management === A common application of AVL is in commercial fleet management, which uses fleet digitalization to monitor and manage vehicles. AVL enables a fleet telematics system to function. It is used to: Improve operational efficiency Dispatchers can view the real-time location of every vehicle, allowing them to assign the nearest driver to a new job, optimize routes, and monitor deliveries. This helps to reduce fuel costs, a function of fuel-management systems. Enhance safety and security By monitoring vehicle location and speed, managers can receive alerts for unsafe driving behaviors, a component of driver scoring. It also assists in gasoline theft prevention and in locating and recovering stolen vehicles or assets. Automate record-keeping AVL data is used to automatically log mileage for tax purposes, verify hours of service for regulatory compliance, and provide proof of service for billing. === Anti-theft and stolen vehicle recovery (SVR) === AVL is used to prevent vehicle theft and recover stolen assets. Stolen vehicle recovery (SVR) systems use a concealed AVL device that can be activated after a theft is reported. This tracking system then transmits its real-time location to a monitoring center, which coordinates with law enforcement to recover the vehicle. Some systems include features such as: Geofencing Alerting the owner if the vehicle moves outside of a predefined area. Unauthorized movement alerts Sending a notification if the vehicle moves without the ignition being on (e.g., if it is being towed). Remote immobilization Allowing the owner or a monitoring service to remotely prevent the engine from being restarted. === Public transit === AVL technology is used in public transport operations. Transit authorities use it to feed real-time location data from buses and trains into an intelligent transportation system. This enables: Real-time passenger information The data is used by a journey planner or mobile app to provide passengers with accurate predictions of when the next bus or train will arrive. Schedule adherence Operators can monitor if vehicles are running on time and make adjustments to maintain service regularity. Automated announcements The system can automatically trigger next-stop announcements inside the vehicle as it approaches a stop. === Emergency services === Emergency services use AVL to improve response times. A computer-aided dispatch (CAD) system uses the real-time location of all emergency vehicles to identify and dispatch the closest unit to an incident, ensuring help arrives as quickly as possible. === Taxi and ride-hailing === Taxi dispatch and ride-hailing platforms such as Uber and Bolt use AVL technology. The system's ability to track vehicle locations in real-time allows these platforms to efficiently match passengers with the nearest available driver, provide accurate estimated times of arrival (ETAs), and calculate fares based on the precise distance traveled. === Carsharing === Carsharing services rely on AVL to manage their fleets of publicly distributed vehicles. The technology allows users to locate and reserve the nearest available car through a mobile app. The AVL system also enables keyless entry, tracks usage time and mileage for automated billing, and provides the vehicle's location for recovery and maintenance.