What Are Vehicles?

Vehicles are engineered systems designed to transport people, cargo, or payloads from one location to another using mechanical, electrical, or chemical propulsion. As a category within electrical and transportation engineering, the study of vehicles spans their mechanical structures, propulsion systems, control electronics, communication subsystems, and safety architectures. The IEEE Vehicular Technology Society has tracked electrical and electronics technology in vehicles since 1949, reflecting the centrality of electrical systems to vehicle design across ground, rail, air, and sea domains.

The discipline draws on mechanical engineering for structural and dynamics analysis, electrical engineering for power systems and control, and increasingly on computer science and communications engineering as vehicles become connected and automated. Modern vehicles are among the most complex embedded systems produced at scale, integrating hundreds of electronic control units (ECUs) communicating over in-vehicle networks such as CAN (Controller Area Network) and Ethernet, alongside external communication systems for V2X (vehicle-to-everything) connectivity.

Ground Motor Vehicles

Motor vehicles (passenger cars, trucks, buses, and motorcycles) are the largest category by production volume and the primary focus of much vehicular engineering research. Commercial vehicle operations encompass freight trucking, transit, and specialty fleets, all of which impose regulatory requirements on safety systems, emissions, and driver hours. The IEEE Transactions on Vehicular Technology publishes peer-reviewed research on propulsion, power electronics, and communication systems for ground vehicles, covering topics from engine control to platooning protocols. Vehicle dynamics, crash testing standards such as NCAP (New Car Assessment Program), tire-road interaction, and Motor Vehicle Event Data Recorders (MVEDRs) are among the measurement and safety areas that define the technical envelope within which commercial ground vehicles operate.

Electric and Hybrid Vehicles

Electrification has reshaped the powertrain architecture of modern vehicles. Battery electric vehicles (BEVs) use electric motors exclusively, fed by lithium-ion battery packs. Hybrid electric vehicles (HEVs) combine a combustion engine with an electric motor and a small battery to recover braking energy and supplement acceleration. Plug-in hybrid electric vehicles (PHEVs) extend the electric-only range with a larger battery that can be charged from the grid. IEEE Intelligent Transportation Systems research on electric vehicles and intelligent transportation covers the integration of these platforms with smart grids, charging infrastructure, and traffic management systems. EMI control is a specific engineering concern in electric and hybrid vehicles, as the switching of high-current power electronics generates electromagnetic interference that must be suppressed to meet automotive EMC standards.

Unmanned and Autonomous Vehicles

Unmanned vehicles operate without a human driver onboard, relying on onboard autonomy, remote control, or a combination of both. Unmanned ground vehicles (UGVs) and mobile robots navigate surface environments using lidar, cameras, and inertial sensors. Unmanned aerial vehicles (UAVs), commonly called drones, extend the concept to flight, using GPS, inertial measurement units, and real-time flight controllers to execute autonomous missions. IEEE Spectrum coverage of autonomous vehicle technology documents how advances in machine learning-based perception and high-performance embedded computing have accelerated the development of both road-legal autonomous passenger vehicles and commercial UAV platforms. Adaptive vehicle systems, which modify control parameters in response to changing road conditions or payloads, are an active research area spanning both ground and aerial unmanned platforms.

Rail Vehicles

Rail passenger vehicles operate on fixed tracks, which constrains their guidance but permits higher speeds and heavier payloads than road vehicles. Modern rail vehicles use electric traction motors fed by overhead catenary or third rail, with regenerative braking returning energy to the network. Communication-based train control (CBTC) replaces traditional fixed-block signaling with continuous V2I-style data exchange between trains and wayside equipment, enabling closer headways and higher line capacity.

Applications

Vehicles have applications in a wide range of sectors, including:

• Personal and public transportation on road and rail networks
• Military ground, air, and maritime operations
• Freight logistics and cargo tracking with MVEDR data
• Search, rescue, and disaster response using unmanned platforms
• Agricultural automation with GPS-guided field vehicles
• Space exploration with rover and aerial survey vehicles