May 3, 1999 Tornado Storm

On May 3, 1999 a series of 68 tornadoes tore through the plain states. 48 people were killed and $1 billion in property damages was caused by the storm. 16 counties in Oklahoma declared themselves disaster areas. This was a serious tornado outbreak that could have been prepared for.
At the time, the tornado safety guide was very limited on telling citizens what do to in the event of a storm. They mainly told people to seek shelter and get as low as they could to the ground. It failed to mention that hiding under highway overpasses was a bad idea. 2 people were killed because they tried hiding under an overpass and this led to the revision of the guide to include this information. Are we just going to append the tornado safety guide based on the deaths of the uninformed? The guide should have already included this information leading me to believe that they are not as thorough as they could be about their information.