Drove through several construction zones, but no obvious problem such as sharp object, potholes, metal debris; did not feel a bump and was not aware of anything that could have caused a problem. No visible nail or slice in the tire. Was far from home, and had to have temp. tire put on to drive home - despite being parked beside a tire store. Rush hour before a holiday weekend and had to take a long way home because highway driving wasn't possible. Have looked around on the internet and seen that other people have also had problems with the tire wall on these tires. If it had happened on the highway, who know the outcome? It was a complete flat within a very short time and no warning.