CommaCarSegments: Raw CAN Bus Telemetry from 300+ Vehicle Models

CommaCarSegments provides raw CAN bus telemetry collected by commaai from over 300 different production vehicle models. The data was recorded by openpilot users across the USA and international locations and is organized into hierarchical segments by device and route identifiers.

Use Cases

• Reverse engineering vehicle-specific CAN bus signals to identify steering or acceleration commands
• Analyzing driving behavior across 300+ different vehicle makes and models
• Developing and testing open-source driver assistance features within the openpilot ecosystem

Strengths

• Covers 300+ different production vehicle models
• Real-world telemetry from global openpilot users
• Hierarchical organization by device_id and route_id

Limitations

• Raw CAN bus data requires vehicle-specific DBC files for decoding into human-readable values
• Total record count and temporal duration are not specified in the metadata
• Geographic distribution is not quantified beyond general regions

Provenance

Source

commaai

Collection Method

Sensor data recorded from openpilot hardware in production vehicles

Freshness

Last updated January 2026.

Geography

USA and global