The sidewall of my tire completely blew out on a flat, clear road. Leaving my neighborhood, I heard a questionable sound that I thought may be ice build up on my mudflap rubbing against the tire. I continued to monitor my suspicion, as it was hard to tell whether there was actually a sound, or if it was in my head. Turning out of my neighborhood, I continued listening for anything suspicious. After feeling like I was in the clear, I brought the truck up to 45-50mph. Suddenly, the truck began bouncing like crazy, and I was able to manage pulling off to the side of the road. The shoulder was only a couple feet wide, followed by a steep hill, so my truck was sticking out into the road quite far, and it was night time. I sprung into action as quickly as possible to minimize risk as I went to change the tire and replace with the spare. Since it was night time, and the road only had one lane in each direction, there were at least 3 times that my car / myself were almost rammed into, or the car approaching me wasn’t able to see cars approaching from the other direction, and almost caused a head on collision. There hasn’t been an official inspection of the tire yet. There were no warning lamps prior to the failure. The only symptoms of the problem were a suspected sound that may or may not have actually been there. Tire size: 275-55R-20