37 lines
2.3 KiB
Markdown
37 lines
2.3 KiB
Markdown
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# Safety
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openpilot is an Adaptive Cruise Control (ACC) and Automated Lane Centering (ALC) system.
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Like other ACC and ALC systems, openpilot is a failsafe passive system and it requires the
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driver to be alert and to pay attention at all times.
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In order to enforce driver alertness, openpilot includes a driver monitoring feature
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that alerts the driver when distracted.
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However, even with an attentive driver, we must make further efforts for the system to be
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safe. We repeat, **driver alertness is necessary, but not sufficient, for openpilot to be
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used safely** and openpilot is provided with no warranty of fitness for any purpose.
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openpilot is developed in good faith to be compliant with FMVSS requirements and to follow
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industry standards of safety for Level 2 Driver Assistance Systems. In particular, we observe
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ISO26262 guidelines, including those from [pertinent documents](https://www.nhtsa.gov/sites/nhtsa.dot.gov/files/documents/13498a_812_573_alcsystemreport.pdf)
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released by NHTSA. In addition, we impose strict coding guidelines (like [MISRA C : 2012](https://www.misra.org.uk/what-is-misra/))
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on parts of openpilot that are safety relevant. We also perform software-in-the-loop,
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hardware-in-the-loop and in-vehicle tests before each software release.
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Following Hazard and Risk Analysis and FMEA, at a very high level, we have designed openpilot
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ensuring two main safety requirements.
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1. The driver must always be capable to immediately retake manual control of the vehicle,
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by stepping on the brake pedal or by pressing the cancel button.
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2. The vehicle must not alter its trajectory too quickly for the driver to safely
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react. This means that while the system is engaged, the actuators are constrained
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to operate within reasonable limits[^1].
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For additional safety implementation details, refer to [panda safety model](https://github.com/commaai/panda#safety-model). For vehicle specific implementation of the safety concept, refer to [panda/board/safety/](https://github.com/commaai/panda/tree/master/board/safety).
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**Extra note**: comma.ai strongly discourages the use of openpilot forks with safety code either missing or
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not fully meeting the above requirements.
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[^1]: For these actuator limits we observe ISO11270 and ISO15622. Lateral limits described there translate to 0.9 seconds of maximum actuation to achieve a 1m lateral deviation.
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