What does datum refer to in vehicle repair?

Datum in vehicle repair refers to an imaginary line or plane that serves as a reference point for measuring heights and aligning various components of a vehicle. It is crucial in ensuring that repairs, especially after an impact, are performed accurately. When a vehicle is damaged, establishing a datum allows technicians to determine the deformation of various parts in relation to this reference point, ensuring proper restoration of the vehicle's frame and suspension. This helps maintain the vehicle’s structural integrity and ensures that all repaired components align correctly, resulting in safe and optimal performance. The use of a datum is common in measuring and setting up other alignment references to facilitate precise corrections and adjustments during the repair process.