I was traveling on I-94 from madison, wi to minneapolis, mn in late December. The interstate was in good driving condition -- no ice, snow, or rain. It was a nice day with little wind and temperature in the mid-20's. I was in the left lane, passing a slower car in the right lane. I was traveling at 75 mph with cruise control on. Just as I pulled ahead of the other car, my 2009 Toyota Rav4 pulled violently to the left. I thought we might roll, but then the car stabilized and I was able to maintain control. There was no obvious external cause for the lurch to the left. It felt like a blowout, but we stopped to check the tires and they were fine. It couldn't have been wind sheer because there was very little wind. There were no potholes in the road. At the time I thought the car to my right might have hit a rock or something and sent it sliding into my path. I suppose that's a possibility, but I didn't see anything behind me in the rear view mirror, so I think it's unlikely. I'm wondering if a malfunction of the electronic stability control occurred there has been no recurrence.

- Black Earth, WI, USA

An emergency stop from highway speeds (65 mph) on hot (85+F) dry pavement resulted in a significantly less than expected braking capacity. Best guess is that the traction control system throttled back available braking capacity. Brake pedal can be pushed to the floor at will but the traction control system takes over braking. The brakes cannot be immediately released and additional pressure (braking) cannot be applied.

- Redmond, WA, USA