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I have read several recent posts re driving and I would like to add a few thoughts. As I have previously chronicled in excerpts from my conceptual model of PD gait I have proposed that there likely is an impairment of visual perception or visual processing of low velocity changes in motion. This impairment is the underlying cause of most of the gait problems associated with PD, and a specific driving problem as well. Significant others and sometimes PD'ers themselves will notice that while driving, when they see the car in front of them begin to slow down they will very rationally and appropriately apply the brakes. This very normal braking maneuver lasts throughout the braking episode until one reaches approximately the last 5% of the braking cycle, i.e. just prior to coming to a complete stop. At this point the driver suddenly finds himself prematurely on top of the car in front of him and a necessity for a panic stop occurs. This, in my opinion, is a manifestation of the visual pathology of PD. One can compensate for this by anticipating it and slightly overbraking at this point in the brake cycle - a kind of cognitive compensation for a perceptive deficit. regards, Tom