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A data channel that records the degree and direction of steering input. Excess steering angle often indicates the driver is fighting the car, while smooth and minimal steering suggests the driver is working with the car's natural balance.
Segers uses steering angle as a primary diagnostic in Analysis Techniques for Racecar Data Acquisition: "Characteristic to understeer is the excessive steering angle. When on corner entry the steering angle gradually keeps increasing, we're dealing with understeer. In this case the steering angle will often peak before the lateral G trace. Mid-corner and corner exit understeer generally shows a gradual decrease in the lateral G trace, while steering angle increases." For oversteer diagnosis: "Steering corrections for oversteer very often are accompanied by little dips in the lateral G graph, parallel to the steering wheel movement. In general, lateral acceleration levels are lower than expected. Oversteer creates a rough lateral G graph as the car loses and regains grip. Variations smaller than 0.25 G and of a short duration" are typical oversteer signatures.