This study experimentally assessed drivers' visual perception of their driving speed and distances on an urban road covered with snow and ice. The driving speeds and distances of two test cars were measured by the instrument of the fifth wheel. In the meantime, the drivers' estimates of driving speeds and distances between two test cars were surveyed by inspectors in cars. The measures of speed and distance of the two cars were compared with the driver's visual perception. The characteristics of the driver's perception in snow and ice environments were compared with that in non-snow and non-ice environments. Results shows that the drivers' perceived speed on snow and ice road were lower than that on non-snow and non-ice road; drivers' perceived distance values showed no significant differences between snow and ice roads and non-snow and non ice roads.
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