What does L4 represent?
2 Answers
L4 refers to a standard inline 4-cylinder engine, which is used in the vast majority of small-displacement vehicles. Energy Conversion: An engine is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. For example, an internal combustion engine typically converts chemical energy into mechanical energy. Device: An engine can refer to either a power generation device or the entire machine including the power unit (e.g., gasoline engines, aircraft engines). The engine was first developed in the UK, so the concept of an engine originates from English, with its original meaning referring to a "mechanical device that generates power."
When we talk about L4, it refers to Level 4 autonomous driving, which belongs to the fourth level in the field of automotive intelligence. Simply put, the vehicle can drive completely on its own under specified conditions, such as in designated urban areas or on highways. The system handles all driving tasks, allowing you to fully relax or engage in other activities without needing to constantly monitor or take over. For example, in some test areas like Phoenix or closed campuses, services like Waymo have already achieved L4-like functionality, where the car can start, turn, and park autonomously. The benefits are tangible: during long trips or peak traffic hours, it can save you effort and reduce stress while enhancing safety, as the system minimizes human errors like distraction or fatigue. However, it has limitations—it can't operate in all environments, such as severe weather or unmapped remote areas, relying on advanced technologies like radar, cameras, and AI algorithms to ensure stability. Overall, L4 is a crucial direction for future mobility, currently in the promotion phase, but once perfected, it will make daily life easier and more efficient.
