VINs: The Encoding Stamped into Steel
10 hours ago
- #Encoding Standards
- #ISO 3779
- #Vehicle Identification Number
- The author is fascinated by encoding standards, specifically highlighting ISO 3779 for Vehicle Identification Numbers (VINs).
- A VIN is a 17-character code that encodes manufacturer, vehicle details, model year, assembly plant, and production number, with design choices like excluding easily confused characters to prevent errors.
- The check digit in position 9 helps detect common transcription errors, though it is not universally required by ISO 3779.
- Model year encoding cycles every 30 years due to character limitations, requiring context for disambiguation, but this rarely causes issues in practice.
- Trim level, color, and title status are not included in VINs because they can change over time, but companies like CarGurus use VINs as keys to infer or link such information from external databases.
- VINs serve as a stable, immutable foundation for coordination in automotive industries, enabling tasks like warranty tracking, recalls, and online marketplace listings.