the first sound which sounded different to bill greer and roy kellerman in the front seat, bill wondered if he'd had a blowout, so he tapped the pedal real quick to see if there was stability in the car. but if you watch the zack pruder film, you don't even see a slowing down of the car. you can -- >> it was difficult making the turn because it's great or than a 90-degree turn. when you go out here, you'll notice houston turning onto elm is a pretty sharp turn. and that's a pretty good-sized car. doesn't have a great turning radius. and so he had to slow down considerably. so much so that the motorcycle outriders had a difficult time keeping their bikes upright as they made the turn. and then when we got going, he was trying to get up to 11 to 12 miles an hour which is what we were running when we came down main street unless the crowds were too close to the car, but that was generally what we were running. >> and kennedy's drive, bill greer, had not driven the route before, but he knew to follow chief curry in the car in this front because curry, obviously, would know the route. >> that