This Paper summarizes the results of research on the causes of windshield veiling glare in automotive vehicles. A special test apparatus was and built to simulate real-world windshield glare conditions. Four subjects were required to perform identification tasks under various levels of veiling glare. Error frequency and discomfort rating were used as the measurement of glare level. Results show the influence windshield glare from such parameters as solar brightness, solar position, windshield angle and instrument panel top color. Instrument panel color was evaluated using the Munsell attributes of Hue, Value, and Chroma.