comma four is an AI-powered active driver assistance system designed as an upgrade for existing vehicles, operating as a plug-and-play device. Its core functionalities include lane centering, dashcam recording, adaptive cruise control, lane changing, and 360° vision. The system, leveraging openpilot software, is described as capable of extended autonomous driving without constant driver intervention.

The methodology for integration is presented as straightforward: "Buy it, plug it in, and engage," indicating a user-friendly, non-invasive installation with compatible vehicles. While the document specifies the capabilities are AI-driven, it does not detail the underlying technical methodologies of its artificial intelligence or control algorithms, such as neural network architectures, sensor fusion techniques, or path planning strategies. The "methodology" primarily refers to the functional application of advanced driver assistance features.

The system boasts broad compatibility, supporting over 325 car models from 27 brands, including specific mention of Toyota, Hyundai, and Ford. Examples of supported models include the Hyundai Sonata (2020-23), Hyundai Palisade (2020-22), Kia Niro EV (2019-23), Lexus ES (2019-22), Toyota Corolla (2020-22), and Toyota Rav4 (2019-22).

The product's efficacy and adoption are supported by metrics: over 300 million miles driven by 20,000 users. Its open-source nature is highlighted by a GitHub repository with 50,000 stars. The company behind comma four, comma, is actively recruiting for roles in product, autonomy, and operations, seeking independent and impactful individuals. The company maintains a presence on 𝕏 (@comma_ai).