Of the 12 or so people under one particular bridge, only one had no serious injuries. The rest suffered injuries including, but not limited to, missing fingers, missing ears, missing noses, broken bones and an impaling from a 2x4 and other debris. Take note of the weather forecast from the National Weather Service. Also, be aware and act wisely concerning the current weather around you. For example, do not drive blindly into a storm if you do not know its severity.
Overpasses are dangerous in a tornado.
Your risk of injury is much lower by seeking an interior room in a basement or lowest level of your home where the walls will provide protection from the debris thrown about in a tornado. Remember, it is not the wind that usually kills, it is the debris in the wind that can kill or severely injure. Overpasses are dangerous in a tornado. Several times already, highways have become giant parking lots as motorists have abandoned their vehicles seeking shelter under bridges from hail and tornadoes. The free flow of traffic becomes blocked preventing possible escape by others.