Gjac, I'm reasonably sure it was punctured as I approached the light. The road was rough in the left lane and there was debris on the roadway. Could have been anything and there may be something inside the tire. I haven't gotten it replaced yet and I'll do that probably next week. I'll be curious to see if there is something lodged inside. Driving across the roadway could have dislodged whatever it was. The blowout I had last summer didn't leave anything inside and nothing stuck in it but the tire store said I hit something that penetrated the sidewall.