Road Marking Contrast Threshold Revisited

Sufficient contrast between road surface and markings is key for a safe comfortable driving experience. This calls comprehensive well established (threshold) model, which ideally results in single threshold value independent of object angular size or luminance. The model introduced by Adrian still commonly used lighting. More recently, new metrics that also predict supra-threshold visibility have been proposed, but the corresponding thresholds are not yet known. In present study, participants presented rendering highway, including marking arrows various luminance were asked to indicate direction arrow. surface, acting as background markings, was varied too. Due very low values small differences luminance, measurement accuracy calibration issues require special attention. show good agreement with Adrian’s (R2 = 0.75) terms contrast, size. addition, we our experimental data define several other existing image based models. Unfortunately, it seems be impossible state one unique