>> we're going north 125. and the accelerator is stuck. hold on. >> four people died in that october incident, including a state trooper who was at the wheel. it involves a lexus made by toyota and the cause of the stuck accelerator was tied to a floor mat issue. but this signalled a much more widespread issue with gas pedals that has idled dealerships and factories. there's a fix with parts being shipped to dealers, but the national highway traffic safety administration tells cnn, they are continuing to investigate a range of potential causes, including issues with the car's electronics. ryan todd is working the story for us. brian, tell us what you're learning. >> learning a lot about what toyota drivers can do, wolf. in the meantime, while they're having their gas pedals kind of