What's 'tau dot'? Have you properly cast it in minuscule?
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Mister MicawberWhat's 'tau dot'?It is a model to estimate the time to collision. When a driver is driving toward a stationary object, the relative expansion rate of the object's image on the retina (the visual variable tau) approximates the time to collision. By changing the speed, the driver can change the rate of expansion of the retinal image.