This topic, of course, begs the question: When it comes to a tornadic circulation interacting with an overpass - What is reality? This is an extremely difficult question to answer because it depends on many factors including (but not limited to):
To our knowledge, this topic has never been studied scientifically. There have been no modeling studies done regarding the interaction of tornadic winds and an overpass. In the absence of careful scientific and engineering research into this question, no definitive recommendations can be made. There are some widespread misconceptions about this topic, however. These misconceptions are illustrated on the next few slides.