I guess this is not going to be a popular opinion, but people’s reactions in some cases were way too intense for this. What you had was a text message. If it had been true, what exactly were you going to do about it? I can see getting off the highway, finding somewhere to park, heading to an interior room, etc. That’s all fine. But the panic is not helpful. Yet you know if it was a real deal people would get even more crazy. Then one person over-reacts causing another and another and so-on.
Not that I think anything can be done to actually stop that reaction.