Abstract
135 Subjectively Equal Speed experiments were designed by using the Forced-Choice Method, 6 males and 2 females’ experiment results indicated that fog exerts a two-way influence to the driver's speed perception. When visibility was low (e.g:39m), fog resulted in overestimation of the speed, When visibility was higher, fog resulted in underestimation of the speed, it is not in accordance with one-way influence of Anstis and Snowden. Have analyzed the reason why the experimental result is inconsistent and emerge in terms of light stream rate and contrast ratio in thesis. When visibility is low, the nearby optical flow rate is great which cause the driver overestimate the speed; When visibility is higher, the decline of contrast cause the driver underestimate the speed.
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